12 Speed 6x4 Trucks For Sale

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2021 Freightliner Cascadia 126 Sleeper Semi Truck - 72" Raised Roof Sleeper, Detroit 400HP, 12 Speed Dt12 Automatic

Price Drop $56,900 USD

** ASK FOR LOW COST DELIVERY AVAILABLE TO ALL 48 STATES!! ***, DEF, AIR RIDE, AUTOMATIC, Se Habla Español! NO CREDIT? BAD CREDIT? NO PROBLEM!! OPEN 7 DAYS A WEEK!!!! Disclaimer:, “All...

Condition	Used
Usage	491,063 Miles
Duty Class	Heavy Duty Sleeper Semi Truck
Horse Power	455 HP
Engine Model	Detroit DD15
Drivetrain	6x4
Transmission	12 Speed Detroit DT12 Automatic
Sleeper Type	Raised Roof Sleeper
Sleeper Size	72"
Suspension	Air Ride
Rear Axle	Tandem Axle
Rear End	40,000 lb 2.28 ratio
Stock Number	N15121-DELIVERY 2 U
MLS Number	13747992
Category	Sleeper Semi Trucks
Last Updated	12/31/2025
Location	Turlock, CA, US
Sold By	Diamond Truck Sales Inc

(844) 940-___ SHOW
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Featured Item

2021 Freightliner Cascadia 126 Sleeper Semi Truck - Raised Roof Sleeper, Detroit 455HP, 12 Speed Dt12 Automatic

$54,999 USD

FEDEX SPEC CALL TIPTON CONQUEST FOR TRUCK AND TRAILER SALES!,

Condition	Used
Usage	474,000 Miles
Duty Class	Heavy Duty Sleeper Semi Truck
Horse Power	455 HP
Engine Model	Detroit DD15
Drivetrain	6x4
Transmission	12 Speed Detroit DT12 Automatic
Sleeper Type	Raised Roof Sleeper
Suspension	Air Ride
Rear Axle	Tandem Axle
MLS Number	13813860
Category	Sleeper Semi Trucks
Last Updated	12/22/2025
Location	Odenville, AL, US
Sold By	Used Truck and Trailer, Inc.

(844) 321-___ SHOW
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Featured Item

2023 Freightliner Cascadia 126 Sleeper Semi Truck - 72" Raised Roof Sleeper, Detroit 455HP, 12 Speed Dt12 Automatic

$85,900 USD

Balance of Detroit Diesel 5 Year/500K Mile Major Components (PARTS ONLY) Warranty and 5 Year/750K Mile Basic Transmission Warranty In Service: 09/19/2022, LEAD TRUCK,

Condition	Used
Usage	5,631 Hours
Duty Class	Heavy Duty Sleeper Semi Truck
Horse Power	455 HP
Engine Model	Detroit DD15
Drivetrain	6x4
Transmission	12 Speed Detroit DT12 Automatic
Sleeper Type	Raised Roof Sleeper
Sleeper Size	72"
Suspension	4 Bag Air Ride
Rear Axle	Tandem Axle
Rear End	40,000 lb 2.85 ratio
Stock Number	1718
MLS Number	14044092
Category	Sleeper Semi Trucks
Last Updated	12/31/2025
Location	Fontana, CA, US
Sold By	Yerevan Truck & Equipment Sales

(844) 321-___ SHOW
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Featured Item

2024 Freightliner Cascadia 126 Sleeper Semi Truck - 72" Raised Roof Sleeper, Detroit 455HP, 12 Speed Dt12 Automatic

$95,900 USD

Balance of Detroit Diesel 5 Year/500K Mile Major Components (PARTS ONLY) Warranty and 5 Year/750K Mile Basic Transmission Warranty In Service: 03/06/2023,

Condition	Used
Usage	5,326 Hours
Duty Class	Heavy Duty Sleeper Semi Truck
Horse Power	455 HP
Engine Model	Detroit DD15
Drivetrain	6x4
Transmission	12 Speed Detroit DT12 Automatic
Sleeper Type	Raised Roof Sleeper
Sleeper Size	72"
Suspension	4 Bag Air Ride
Rear Axle	Tandem Axle
Rear End	40,000 lb 2.85 ratio
Stock Number	1714
MLS Number	14044040
Category	Sleeper Semi Trucks
Last Updated	12/31/2025
Location	Fontana, CA, US
Sold By	Yerevan Truck & Equipment Sales

(844) 321-___ SHOW
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Featured Item

2022 Volvo VNL64T760 Sleeper Semi Truck - 76" Raised Roof Sleeper, D13 455HP, 12 Speed I Shift Automatic

$69,900 USD

Manufacturer’s Engine Warranty: Balance of VOLVO 5 Year/500,000 Mile Plan 2 and Major Components Warranty. In Service: 3/17/2021,

Condition	Used
Usage	12,027 Hours
Duty Class	Heavy Duty Sleeper Semi Truck
Horse Power	455 HP
Engine Model	Volvo D13
Drivetrain	6x4
Transmission	12 Speed I Shift Automatic
Sleeper Type	Raised Roof Sleeper
Sleeper Size	76"
Suspension	4 Bag Air Ride
Rear Axle	Tandem Axle
Rear End	40,000 lb 3.08 ratio
Stock Number	1712
MLS Number	14044011
Category	Sleeper Semi Trucks
Last Updated	12/31/2025
Location	Fontana, CA, US
Sold By	Yerevan Truck & Equipment Sales

(833) 478-___ SHOW
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Featured Item

2022 Peterbilt 389 Day Cab Truck - Paccar 505HP, 12 Speed Endurant Amt

$135,495 USD

Stock 4362C — 2022 Peterbilt 389 Day Cab, 505HP PACCAR , Endurant Auto , Full Lockers , Digital Dash , 13 Gauges Super sharp 2022 Pete 389 Day Cab with only 163,839 miles and equipped with...

Condition	Used
Usage	163,839 Miles
Duty Class	Heavy Duty Day Cab Truck
Horse Power	505 HP
Drivetrain	6x4
Transmission	12 Speed Endurant Automated
Suspension	Air Ride
Rear Axle	Tandem Axle
Rear End	40,000 lb 3.70 ratio
Stock Number	4362C
MLS Number	13794325
Category	Day Cab Semi Trucks
Last Updated	12/15/2025
Location	Palmetto, GA, US
Sold By	7E Truck Sales, LLC

(903) 670-___ SHOW
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Featured Item

2019 Peterbilt 579 Sleeper Semi Truck

$30,000 USD

We have 4 2019 Peterbilt 579 with a MX13 under 500,000 miles. These trucks have a 12-speed automatic transmission, good rubber with disc brakes. We have 4 unit available and ready to go on...

Warranty

Quantity	4
Condition	Used
Usage	442,000 Miles
Duty Class	Heavy Duty Sleeper Semi Truck
Horse Power	380 HP
Engine Model	Paccar MX/MX-13
Drivetrain	6x4
Transmission	12 Speed Ultrashift Automatic
Sleeper Type	Ultracab Unibilt
Sleeper Size	80"
MLS Number	14028244
Category	Sleeper Semi Trucks
Last Updated	12/11/2025
Location	Athens, TX, US
Sold By	Athens Trailer & Truck Sales, LLC.

(855) 489-___ SHOW
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Featured Item

2021 Kenworth T680 Sleeper Semi Truck - 72" Raised Roof Sleeper, Paccar 455HP, 12 Speed Endurant Amt

$49,000 USD

Super Clean! Fleet Maintained, Price includes 6 month/50k Mile Premium 2000 Warranty (Engine, Turbo, Injectors, Aftertreatment), 455hp with Endurant 12 Speed Transmission, Aluminum Wheels,...

Condition	Used
Usage	412,535 Miles
Duty Class	Heavy Duty Sleeper Semi Truck
Horse Power	455 HP
Engine Model	Paccar MX-13
Drivetrain	6x4
Transmission	12 Speed Endurant Automated
Sleeper Type	Raised Roof Sleeper
Sleeper Size	72"
Suspension	Air Ride
Rear Axle	Tandem Axle
Rear End	2.79 ratio
Stock Number	2107
MLS Number	13693285
Category	Sleeper Semi Trucks
Last Updated	12/11/2025
Location	Rhome, TX, US
Sold By	Jordan Truck Sales of Texas, LLC

(855) 807-___ SHOW
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Featured Item

2021 International LT Dump Truck - Cummins 450HP, 12 Speed Automatic, 13' Dump

$59,500 USD

CUMMINS X15 POWER WITH EATON FULLER AUTOMATIC!! CLEAN FLEET MAINTAINED ! AUTOMATIC! JAKES, LOCKERS, FLEET MAINTAINED, VIRGIN RUBBER! BRAND NEW 13'X56" DUMP BED, NEW PTO, TANK, TARP, 18 CU...

Condition	Used
Usage	427,219 Miles
Duty Class	Heavy Duty Dump Truck
Bed Length	13 ft.
Horse Power	450 HP
Engine Model	Cummins X15
Drivetrain	6x4
Transmission	12 Speed Automatic
Suspension	Air Ride
Rear Axle	Tandem Axle
Rear End	40,000 lb 2.79 ratio
Stock Number	7148
MLS Number	14023738
Category	Dump Trucks
Last Updated	12/26/2025
Location	Houston, TX, US
Sold By	Southern Truck Sales Ltd

(866) 543-___ SHOW
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Featured Item

2020 Peterbilt 579 Day Cab Truck

Contact for price

Powertrain,  Engine: PACCAR MX-13. This engine offers a variety of configurations o Max Horsepower: Up to 500 hp o Max Torque: Up to 1,850 lb-ft  Transmission: PACCAR automated...

Condition	Used
Usage	154,346 Miles
Duty Class	Heavy Duty Day Cab Truck
Horse Power	500 HP
Engine Model	Paccar MX/MX-13
Drivetrain	6x4
Transmission	12 Speed Automated
Suspension	Air Leaf
Rear Axle	Tandem Axle
Stock Number	661428
MLS Number	13876828
Category	Day Cab Semi Trucks
Last Updated	12/17/2025
Location	Charlotte, NC, US
Sold By	Jayma Qualified, LLC

(866) 530-___ SHOW
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2020 Volvo VNL64T760 Sleeper Semi Truck - D13 425HP, 12 Speed I Shift Automatic

Recently Updated

$57,995 USD

***Our End-of-Year Sale is here — save up to $3,500 off on select trucks until December 31!***, 2020 VOLVO VNL 760, VOLVO D13, AUTOMATIC I-SHIFT, 490,965 MILES, GREAT CONDITION, FLEET...

Condition	Used
Usage	490,965 Miles
Duty Class	Heavy Duty Sleeper Semi Truck
Horse Power	425 HP
Engine Model	Volvo D13
Drivetrain	6x4
Transmission	12 Speed I Shift Automatic
Suspension	Air Ride
Rear Axle	Tandem Axle
Rear End	40,000 lb 2.47 ratio
Stock Number	242529
MLS Number	13540075
Category	Sleeper Semi Trucks
Last Updated	1/5/2026
Location	Fontana, CA, US
Sold By	Fontana Truck Outlet

2022 Kenworth T680 Sleeper Semi Truck - 76" Raised Roof Sleeper, Paccar 405HP, 12 Speed Endurant Amt

Recently Updated

$69,950 USD

**Stock Photos of Similar Unit, more pictures Coming Soon!** 2022 Kenworth T680 –, SUPER LOW MILES AND REMAING FACTORY WARRANTY, Built for serious operators, this 2022 Kenworth T680...

Condition	Used
Usage	183,789 Miles
Duty Class	Heavy Duty Sleeper Semi Truck
Horse Power	455 HP
Engine Model	Paccar MX-13
Drivetrain	6x4
Transmission	12 Speed Endurant Automated
Sleeper Type	Raised Roof Sleeper
Sleeper Size	76"
Suspension	Air Ride
Rear Axle	Tandem Axle
Rear End	40,000 lb
Stock Number	DD10770
MLS Number	13852468
Category	Sleeper Semi Trucks
Last Updated	1/4/2026
Location	Kansas City, MO, US
Sold By	Michelle Sells Trucks

(909) 775-___ SHOW
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2022 Freightliner Cascadia 126 Sleeper Semi Truck - Raised Roof Sleeper, Detroit 505HP, 12 Speed Dt12 Automatic

Newly Listed

Contact for price

Contact Sergio,

Condition	Used
Usage	512,354 Miles
Duty Class	Heavy Duty Sleeper Semi Truck
Horse Power	505 HP
Engine Model	Detroit DD15
Drivetrain	6x4
Transmission	12 Speed Detroit DT12 Automatic
Sleeper Type	Raised Roof Sleeper
Suspension	Air Ride
Rear Axle	Tandem Axle
Stock Number	2626
MLS Number	14070071
Category	Sleeper Semi Trucks
Last Updated	1/5/2026
Location	Fontana, CA, US
Sold By	TCI Transportation

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2019 Freightliner Cascadia 126 Sleeper Semi Truck - Raised Roof Sleeper, Detroit 505HP, 12 Speed Dt12 Automatic

Newly Listed

$37,900 USD

*** ASK FOR LOW COST DELIVERY AVAILABLE TO ALL 48 STATES!! *** SLIDING 5TH WHEEL!!!!! AIR RIDE, Se Habla Español! NO CREDIT? BAD CREDIT? NO PROBLEM!! OPEN 7 DAYS A WEEK!!!! Disclaimer:,...

Condition	Used
Usage	723,089 Miles
Duty Class	Heavy Duty Sleeper Semi Truck
Horse Power	505 HP
Engine Model	Detroit DD15
Drivetrain	6x4
Transmission	12 Speed Detroit DT12 Automatic
Sleeper Type	Raised Roof Sleeper
Suspension	Air Ride
Rear Axle	Tandem Axle
Rear End	2.85 ratio
Stock Number	L01650-DELIVERY 2 U
MLS Number	14069928
Category	Sleeper Semi Trucks
Last Updated	1/3/2026
Location	Fontana, CA, US
Sold By	Diamond Truck Sales Inc

2020 Freightliner Cascadia 113 Tri Axle Day Cab Truck - Detroit 470HP, 12 Speed Dt12 Automatic

Newly Listed

Contact for price

2 Available, Factory Tri Axle Trucks, One Owner, Contact Ed Gibbs,

Quantity	2
Condition	Used
Usage	125,576 Miles
Duty Class	Heavy Duty Day Cab Truck
Horse Power	470 HP
Drivetrain	6x4
Transmission	12 Speed Detroit DT12 Automatic
Suspension	Air Ride
Rear Axle	Tri Axle
Rear End	40,000 lb
MLS Number	14069802
Category	Day Cab Semi Trucks
Last Updated	1/3/2026
Location	Phoenix, AZ, US
Sold By	TCI Transportation

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2021 Freightliner Cascadia 126 Sleeper Semi Truck - 71" Raised Roof Sleeper, Detroit 400HP, 12 Speed Dt12 Automatic

Recently Updated

$58,900 USD

*** ASK FOR LOW COST DELIVERY AVAILABLE TO ALL 48 STATES!! *** ***ALMOST NEW VIRGIN RUBBERS*** SLIDING 5TH WHEEL!!!!! AIR RIDE, ATC SPIN, HSA OFF Se Habla Español! NO CREDIT? BAD CREDIT? NO...

Condition	Used
Usage	477,847 Miles
Duty Class	Heavy Duty Sleeper Semi Truck
Horse Power	400 HP
Engine Model	Detroit DD15
Drivetrain	6x4
Transmission	12 Speed Detroit DT12 Automatic
Sleeper Type	Raised Roof Sleeper
Sleeper Size	71"
Suspension	Air Ride
Rear Axle	Tandem Axle
Rear End	40,000 lb 2.28 ratio
Stock Number	N15258-DELIVERY 2 U
MLS Number	14059528
Category	Sleeper Semi Trucks
Last Updated	1/3/2026
Location	Turlock, CA, US
Sold By	Diamond Truck Sales Inc

2021 Kenworth T680 Sleeper Semi Truck - 76" Raised Roof Sleeper, Cummins 450HP, 12 Speed Amt

Price Drop $44,950 USD

For Sale: 2021 Kenworth T680 Sleeper - Multiple Matching Units Available Equipped with a 450hp Cummins X15, paired with a 12-Speed Automatic Transmission, 76" Raised Roof Double Bunk Sleeper...

Condition	Used
Usage	498,927 Miles
Duty Class	Heavy Duty Sleeper Semi Truck
Horse Power	450 HP
Engine Model	Cummins X15
Drivetrain	6x4
Transmission	12 Speed Automated
Sleeper Type	Raised Roof Sleeper
Sleeper Size	76"
Suspension	Air Ride
Rear Axle	Tandem Axle
Rear End	40,000 lb 2.64 ratio
Stock Number	MO10672
MLS Number	14045697
Category	Sleeper Semi Trucks
Last Updated	1/3/2026
Location	Commerce City, CO, US
Sold By	Michelle Sells Trucks

2021 Kenworth T680 Sleeper Semi Truck - 76" Raised Roof Sleeper, Cummins 450HP, 12 Speed Amt

Price Drop $44,950 USD

AVAILABLE FOR SALE IN KANSAS CITY, MO!!, CALL ME FOR MORE INFO. 2021 Kenworth T680 Sleeper - Multiple Matching Units Available Equipped with a 450hp Cummins X15, paired with a 12-Speed...

Condition	Used
Usage	498,927 Miles
Duty Class	Heavy Duty Sleeper Semi Truck
Horse Power	450 HP
Engine Model	Cummins X15
Drivetrain	6x4
Transmission	12 Speed Automated
Sleeper Type	Raised Roof Sleeper
Sleeper Size	76"
Suspension	Air Ride
Rear Axle	Tandem Axle
Rear End	40,000 lb 2.64 ratio
Stock Number	MO10672
MLS Number	14045696
Category	Sleeper Semi Trucks
Last Updated	1/3/2026
Location	Kansas City, MO, US
Sold By	Michelle Sells Trucks

2022 Kenworth W990 Sleeper Semi Truck - 76" Mid Roof Sleeper, Paccar 455HP, 12 Speed Endurant Amt

Recently Updated

$77,950 USD

**TRUCK IS LOADED WITH TRIPAC APU, ESPAR BUNK HEATER, FACTORY WARRANTY TIL JULY OF 2026, DUAL CHROME STACKS, 275" WHEELBASE, CHROME GRILL BUMPER, HIGH END TRIM PACKAGE, DIAMOND INTERIOR,...

Condition	Used
Usage	349,811 Miles
Duty Class	Heavy Duty Sleeper Semi Truck
Horse Power	455 HP
Engine Model	Paccar MX-13
Drivetrain	6x4
Transmission	12 Speed Endurant Automated
Sleeper Type	Mid Roof Sleeper
Sleeper Size	76"
Suspension	Air Ride
Rear Axle	Tandem Axle
Rear End	40,000 lb 2.85 ratio
Stock Number	MO10382
MLS Number	14045686
Category	Sleeper Semi Trucks
Last Updated	1/3/2026
Location	Commerce City, CO, US
Sold By	Michelle Sells Trucks

2022 Kenworth W990 Sleeper Semi Truck - 76" Mid Roof Sleeper, Paccar 455HP, 12 Speed Endurant Amt

Recently Updated

$77,950 USD

**TRUCK IS LOADED WITH TRIPAC APU, ESPAR BUNK HEATER, FACTORY WARRANTY TIL JULY OF 2026, DUAL CHROME STACKS, 275" WHEELBASE, CHROME GRILL BUMPER, HIGH END TRIM PACKAGE, DIAMOND INTERIOR,...

Condition	Used
Usage	349,811 Miles
Duty Class	Heavy Duty Sleeper Semi Truck
Horse Power	455 HP
Engine Model	Paccar MX-13
Drivetrain	6x4
Transmission	12 Speed Endurant Automated
Sleeper Type	Mid Roof Sleeper
Sleeper Size	76"
Suspension	Air Ride
Rear Axle	Tandem Axle
Rear End	40,000 lb 2.85 ratio
Stock Number	MO10382
MLS Number	14045683
Category	Sleeper Semi Trucks
Last Updated	1/3/2026
Location	Kansas City, MO, US
Sold By	Michelle Sells Trucks

2024 Peterbilt 579 Day Cab Truck - Paccar 455HP, Automatic

Price Drop $140,000 USD

Multiple Units Available, Extremely low miles 100 to 500 miles Never Used, never put into service, PTO, 2 Line Wet Kit, Hydraulic Cooler, Contact: ED Gibbs for more details,

Quantity	20
Condition	Used
Usage	378 Miles
Duty Class	Heavy Duty Day Cab Truck
Horse Power	456 HP
Engine Model	Paccar MX-13
Drivetrain	6x4
Transmission	12 Speed Autoshift Automatic
Suspension	Air Ride
Rear Axle	Tandem Axle
Rear End	38,000 lb
MLS Number	14002395
Category	Day Cab Semi Trucks
Last Updated	1/3/2026
Location	Phoenix, AZ, US
Sold By	TCI Transportation

2022 Freightliner Cascadia 116 Day Cab Truck - Detroit 450HP, 12 Speed Dt12 Automatic

Recently Updated

Contact for price

More Day Cabs Available, Contact Ed Gibbs for more information and pricing,

Condition	Used
Usage	587,005 Miles
Duty Class	Heavy Duty Day Cab Truck
Horse Power	450 HP
Engine Model	Detroit DD13
Drivetrain	6x4
Transmission	12 Speed Detroit DT12 Automatic
Suspension	Air Ride
Rear Axle	Tandem Axle
Rear End	40,000 lb
MLS Number	13993323
Category	Day Cab Semi Trucks
Last Updated	1/3/2026
Location	Phoenix, AZ, US
Sold By	TCI Transportation

2019 Freightliner Cascadia 113 Day Cab Truck - Detroit 450HP, 12 Speed Dt12 Automatic

Recently Updated

$29,900 USD

More Day Cabs Available, Contact Ed Gibbs for more info and pricing,

Condition	Used
Usage	541,620 Miles
Duty Class	Heavy Duty Day Cab Truck
Horse Power	450 HP
Engine Model	Detroit DD13
Drivetrain	6x4
Transmission	12 Speed Detroit DT12 Automatic
Suspension	Air Ride
Rear Axle	Tandem Axle
Rear End	40,000 lb 3.08 ratio
MLS Number	13993177
Category	Day Cab Semi Trucks
Last Updated	1/3/2026
Location	Phoenix, AZ, US
Sold By	TCI Transportation

(724) 243-___ SHOW
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2022 Peterbilt 579 Sleeper Semi Truck - 72" Raised Roof Sleeper, Cummins 450HP, 12 Speed Endurant Amt

Price Drop $59,900 USD

Freshly PM'd, DOT'd detailed!!, Cummins Power Eaton Auto Trans!, Dual Stacks, Aluminum Wheels!, Put this to work today!,

Condition	Used
Usage	560,922 Miles
Duty Class	Heavy Duty Sleeper Semi Truck
Horse Power	450 HP
Engine Model	Cummins X15
Drivetrain	6x4
Transmission	12 Speed Endurant Automated
Sleeper Type	Raised Roof Sleeper
Sleeper Size	72"
Suspension	Pete Low Air Leaf
Rear Axle	Tandem Axle
Rear End	40,000 lb 3.08 ratio
Stock Number	238953
MLS Number	13973757
Category	Sleeper Semi Trucks
Last Updated	1/3/2026
Location	Smithfield, PA, US
Sold By	Hunter Truck