Indeed I did not have substepping turned on, but after enabling that I get the same result.
The M113 and Ripsaw work fine, but the lighttank and aerosled somehow seem to start floating as if there is no gravity in the scene (if I have to somehow describe it)
One other question… where did you define the Camera horizontal and vertical controls?
I see most input defined in A_TrackedVehicle blueprint and added them all to my project axis and event inputs… but I don’t see where you added the camera inputs.