The M105 trailers are based on the M103 Chassis, Trailer, 1 1/2 ton. The M105 and M105A1 trailers were constructed of steel while the M105A2 used wood and steel. The M105A2 variant also lacked the support leg and landing gear of the other models.

The M104 1 1/2 to cargo trailer was very similar to the M105, but was equipped with 11:00x20 tires to match the M34 and M135 2 1/2 ton cargo trucks. Externally, the M104 series trailers are very similar to the M105.