View 27 Photos View 0 Videos 2020 GMC Sierra Tandem Axle Flatbed Truck - 301HP, 6 Speed Automatic Newly Listed $45,250 USD Used 2020 GMC Sierra Flatbed Truck for sale, 301 HP 6.6L V8 gasoline engine, 6-speed automatic transmission, tandem rear axle, 177" wheelbase, 103-gallon fuel capacity, white color. Check it... ConditionUsedUsage107,869 MilesDuty ClassLight Duty Flatbed TruckHorse Power301 HPEngine ModelGMC 6.6LV8Transmission6 Speed AutomaticSuspensionSpringRear AxleTandem AxleRear End10,400 lb 3.73 ratioStock Number403728 MLS Number14092228CategoryFlatbed Trucks Last Updated1/15/2026 LocationSan Antonio, TX, US Sold ByPenske Used Trucks (855) 942-___ SHOWNUMBERCall Seller Email Seller Save More Info