chaos vehicle, front end loader falling apart upon spawning

Hi guys

i really need help in figuring out why my chaos vehicle breaks upon pressing play.
it works just fine when i have only the body set as default physics type and the wheels as kinamatic, the issue starts when i add another body to the wheels and body, its a front end loader, so when i add the bucket to it then whenever i press play the body falls to the ground and the thing doesnt move, but when i remove the bucket and only keep the body and the wheels, it works fine, i can then move the loader with the w,s,d,a keys, but as soon as i add the bucket as a body it breaks when pressing play, any help?