The Fun Pimps

All my vehicle mods are usable ones. They function the same as vanilla ones usually.

I am using it on my local save with my partner, but I can't seem to find mrap and humvee on the build system 

You probably just can't see their icons if you are looking in the Vehicles crafting skill section. The UI an only show so many. But if you open your inventory and search you can find the parts, and there it will show you what level you need.

thankyou, I will look into as it would be awesome to use them, also sounds abit far fetched have you thought about adding a weapon for them