Ahem!! From the master of loose tracks- Lose those DAMN BFG A/Ts, Claws, Mud terrains and Truxus.
Dont argue, just do it.
You need to find a soft all terrain with plenty of SIPES. They dont need to be 15" wide if the materiel and tread is right.
Run them virtually flat.
Strap 200-400 pounds over the rear axle.( need the weight to launch back there.)
Go up a gear, or two.
BLOW the tires loose out of the hole, do not "pedal" ****,bif blow them loose, get upstairs quick, the tires will catch when the sled puts a little weight on you, and you will be gone.
Ideally, you will snuff it at the end.
Proven system boys, try it, or come back and post how bad you still suck next week, on loose tracks!!:soap: