More thoughts. Since you are thinking sand, a hitch mounted winch could offer some piece of mind. Because of some serious navigation mistakes, I have ended up on some soft sand roads with my old class "C". It actually did quite well as long as I stayed moving.
I ended up reworking my black and grey drains for a much higher mount. I moved up the generator and chassis exhaust exits. I also traveled with an air compressor that could handle reinflation of my DRW tires if I needed to air down.
In my recreation areas logging is common, which means many sandy roads are at least sometimes maintained at 12ft. However, I discovered that another concern for RVs off the beaten path is overhead clearance. A logging truck with equipment or a load is still much less likely to be damaged than an AC unit or rubber like roof.