Cannot get my cart working with Chaos vehicles

Cannot get my cart working with Chaos vehicles

I’ve spent a while on this now trying to build this cart in Unreal Engine 4.27 to work with the chaos vehicle system.

At the moment, I have ported my cart made of 5 parts (chassis & 4 wheels) from Blender with 5 bones.

I set the wheels to kinematic, body to simulated. It just falls apart like they aren’t connected with the wheels disappearing in the physics asset tab.

I added constraints between the chassis and wheels and the whole thing becomes locked like simulate physics is turned off.