ok to start with if you try the wheeled vehicle class then its really the 4wd so it will crash if you have more than 4 whls, ‘n’ whls is not an option from this class atm afaik
the physx wheel colision issue is known and works from skeletal meshes, how this would effect actors build with static meshs i can’t say, but from past tests if you just rotate the static then the colision mesh doesn’t rotate with it, afaik you need to apply torque for the col mesh to rotate, check Alan Noone’s tank tutorial.
i believe the physx issue is due to the line trace of the wheel colision eg checks on each revolution of the wheel, tbh its well beyoud me i just want to warn of issues before people get to deep into dev