I know you don't want to hear this, but put tubes in these tires. With this much weight you need to stiffen up the side walls as much as possible. With out tubes, you will use up the sidewalls very quickly.
My car weighs 3250 lbs (w/ driver), has reworked super stock springs, MT 11.5x29.5, 13.5 lbs, footbrake with 60' time 1.42.

Brian