How to add hind wheel drive to A-Chasis

I’m currently trying to make a vehicle that has hind wheel drive. For example, W,A,S,D controls the front wheels and arrow keys control the hind wheels. However, I’m relatively new to A-Chasis so I don’t really know what I’m doing. I’ve tried tweaking properties in the drive script but I still couldn’t come to a conclusion. If anyone knows how to do this, help would be greatly appreciated.
Monster Truck with hind wheel drive
Result would look similar to this.