I think your going to run into big time handeling problems (actualy i know fro experience). whats going to happen is that the back will be to stiff compaired to the front. when you hit a small bump with only one front tire it will absorb the impact very quickly however when the back tire hits the same bump it will react moer slowly thus kicking the truck sideways. try it, set a rock or a stick (something about an inch and a half will do) out in the road then hit it at moderate speed with one front tire and watch what happens when the back tire hits it. with the stuff that i run on (mostly rough, bumpy ground, hey i live in the rocky mountains what do you expect) i have found that a good set up is 25w in the front and 32.5 in the back (2 back shocks filled with 25w and the other 2 filled with 40w). this makes the back a bit stiffer but not to much.