EG,
Oh, i see you are running duals. That's a whole new ball game for sand. 235's are not very wide, a good thing for deflating duals, and the rest of the 6 tires, but if you find the sidewalls rub together at low pressure, get a couple 1/2" spreader rings for you rear axle studs to go between the wheels. That should be enough. Be sure to have the valve stems in a convenient location for airing up or down. The rubbing of the tires is only a problem if you drive for a long time, and at speed: then the rubbing could cause too much heat and premature sidewall wear. If moving slowly, and for a short time, the problem is minimal.
I think duals can work well on sand if you mollify the pressure and do a lot of experimenting. You will eventually find the sweet spot.
My 10" wide Cooper AT-3's are 35" tall. There is a lot of sidewall for the low pressure tread to wallow out to a 12" patch, some of that actually on the sidewall. They run on the street @ 65 pounds; and are so far very quiet for an all terrain tire. The load rating is 3860 per (7720 per axle): plenty enough for a single. My loaded weight is around 10,600 pounds, so not even close to the 15,440 pound tire load rating.
Just get out there with a way to air back up and try different pressures. Oh, and maybe accompanied by someone with a BIG winch. All will be revealed. You will, over time know when to hold 'em, and when to fold 'em.
jefe