The fill pug is pretty fragile. I destroyed the threads in the plug hole once on my late Rodeo. After that, I used a simple made-up plug - it was holding well. Use as little force for the fill plug as possible, just tighten it a little to keep the plug in place.

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.