Im not sure if you can fit Mini-Z bodies on the Xmod, but Im very sure you can rig something to make it happen..
I currently do not own an overland and am not sure since I deal with my angry beast of a .21 TMAXX. maybe ill get an overland someday..
I dont think the electronics can tolerate offroading dirt. The XMOD is designed for smooth onroad track racing competing against the Mini-Z's in terms of performance and style..
Once i make new discoveries, I'll be sure to let you guys know..