Thank you, Xazas!
There are couple of things you might need to check. First one is a position of the center of mass of the tank relative to position of suspension handles, they shouldn’t be on the same height. Try tweaking Z values of the center of mass offset, it can be higher or lower than position of suspension handles.
Second potential issue is that your fps is significantly different than what I had when tweaking suspension on vehicles, main problem with this project is that it’s not using physics sub-stepping and won’t work correctly under different fps. As fps goes up or down on different systems, tank will behave differently. To solve this issue I’ve started second project and tracked vehicles where moved there: [OPEN-SOURCE] Machinery Modelling Toolkit - World Creation - Epic Developer Community Forums