I checked my Axiom with 3.5DI, and seems like it has a different over-the-spare-tire rear setup. I see a small tank located over my spare tire. This small tank is connected to the gas tank. This is a sort of gas tank pressure system. I do not remember having this small tank on my 3.2 Rodeo. This small tank may be in place where the towing hitch is to be installed.

Another guess is the hitch is not rated for the more powerful engine <img src="/forums/images/graemlins/smile.gif" alt="" />

Oleg
Axiom 4WD 2004: OME shocks, 32" BFG Mudders, RockSliderz, OME929+2" spacers, Stinkyfab bent RE rear links, front ARB locker, rear No-Slip locker, DOR front axle lowering kit, custom middle section skid plate, IronMan torsion bars.
Deceased Rodeo'02 4WD.