This Suspension is a must have item. I've ben testing many different setups.
The only one that survived was this one. There is two versions The red one is all metal the other one got plastic rod ends and break easy. (the springs are plastic)
[IMG]
RearSuspension by
Bo Wallen, on Flickr[/IMG]
It give a lot more stability and a lot more traction even on an empty truck.