Silver back and I discussed this in length, there is only one way to solve the problem of big hp on the trucks
Its a 4 link system, which will consist of moving in the frame rail, and a different rear axle.
The problem is not being able to get a large enough contack patch to the ground, with the inner frame rail and leaf spring set up being the limiting factor.
competition engineering and I cant for my life remember the man Silverback suggested, has everything to do it with.
But take into consideration this CAN be done and stil be streetable,I do plan on this after things get sorted out, hopefully by next fall.
But the fuel tank will have to be relocated to the bed witha fuel cell.
Narrow the rear axle and while you there you might as well get a 9 inch axle since so many lockers and axles are available.
Then cut and fab away at the frame and install a 4 link coil over system.
Other than that Mand H does offer a 16x14.5x30 which is only a tad shorter in heighth , which actually doesnt make a ton of difference, but does have a larger contact patch.
Also as Dave said you can go to a traction control system, but they do hurt the ET's a small amount.
You can also convert to a coiil over system, use locater bars instead of leaf springs, and a centering bar to center the axle, but by then you are closer to a 4 link, jsut a shorter version.
Basics is the front end needs to extend and stay there, adjustable shocks.
The rear axle needs to squat and not bounce downthe track
and as large a contact patch as possible