A straight truck or tractor is a commercial vehicle with a cab and body consisting of one unity; all axles are attached to a single frame.
For Class 8 (trucks weighing 33,001 pounds or more), these vehicles come in one of four options:
- straight truck day cab
- straight truck sleeper cab
- tractor day cab
- tractor sleeper cab
Straight truck: A commercial vehicle with the cab and cargo body or vocational equipment mounted on a single chassis.
Truck tractor: A powered commercial vehicle designed primarily to pull a trailer, rather than carry its main cargo directly on the tractor chassis.
Class 8 trucks and tractors have a gross vehicle weight rating (GVWR) of 33,001 pounds or more. Both straight trucks and tractors may have day cabs or sleeper cabs, depending on their application.
A Class 8 tractor day cab is a vehicle where the trailer is not attached to the chassis, and there is no sleeping compartment for the driver(s). These trucks are utilized in on-highway short-medium haul, regional deliveries, port, or drayage applications.
A Class 8 tractor sleeper cab is a vehicle where the trailer is not attached to the chassis, and there is a sleeping compartment for the driver(s). These trucks are utilized in the bulk of on-highway freight hauling.
