lodni_k,
There are a few resin conversion and complete kits for US Army, and Marine wreckers. Model Fan has botha complete and a conversion for the Italerie 5Ton M936 and one for the HEMMTT wrecker, they are pricey. Real Model has a complete resin kit of the M-62 5-ton wrecker, which looks very close to the M816 wrecker I used to operate in the Army. On e-Bay you can find a Revell (I think) 1/32 scale 5-ton wrecker I am not sure of the model number.
I am assuming that the Marines used the same vehicles that the Army had except for changes in the air intake and exhaust systems. We added them when we practiced beach landings.