V1.58 is this thing! We got some bug fixes, new collision (4), and a new tool/button. It's a vehicle tool, get an unfixable item, click group item, and then set as vehicle. This will be able to make you create your own vehicle. There's 7 toggle options.
1. acceleration - determine how quickly attached joints reach there sat motor speed when pressing up or down.
2. lock joints - (cant explain, read on HW
3. leaning strength - determine how much force is used when leaning using left or right. The rest is to long, find out on Happy Wheels.