LOL that looks totally weird. Hey, maybe you can have it drive sideways and call it a "Crab" humvee Anyway, it might help if you posted the relevant entries in the INI files.
In the tools selection, there is a button that is 3 away from the hammer. Looks like a box with 3 boxes hooked to it. You click on it, then you select your tires, click affect pivot only, then click center to object and align to world.