Oshkosh MTVR is a six-wheel drive all-terrain military vehicle manufactured by Oshkosh Defense.
The model has 6 extras as different truck bodies. There is also a cut 4-extras version included in the pack. More info in the readme file.
The model has 2 camouflages: desert and woods-green.
The truck is made for Vice City. I don't guarantee that it would work in GTAIII properly.