@kensai01
There are two principally different ways how suspension of the tank can be setup in MMT - rigid body physics wheels with constraints or “traces” suspension. As far as I see, you are using rigid body wheels. This was old approach I’ve experimented with and later switched to traced suspension. The main reason is because I couldn’t avoid small jittering of the wheels even when everything is setup correctly. Another issue is performance impact - constraints and rigid bodies are quite expensive compared to raytraces or sweeps.
Anyway, as you have it setup already, it makes sense to try this approach.
It looks lovely is you are using old friction components and this has to be changed. But first, disable friction calculations and check if suspension works correctly - maybe wheels collide with each other or constraint force is too weak/strong.