A truck frame is the main structure of the chassis of a truck that supports the body.Traditional truck frame assemblies consist of side rails ("C" channel frames) and crossmembers.

 

There is no "standard" truck frame--a variety of material thicknesses, channel sizes, and yield strengths can be found from truck to truck. In addition, a wide variety of crossmember designs can be found from truck to truck.

 

The overall strength of your truck frame assembly is driven by your choice of material thickness, yield strength, channel size, and overall configuration.