[lance-n]

I haven't done very much Dune driving, but I do get out on the beach at least a couple times per week.
That was some good advice to use 4 high, lots of gas and te A/C on recirc.
You really don't want to stop in the soft stuff. Another tip is not to turn too sharply, as it seems to cause the front end to dig in and the rear push doesn't have a chance when the wheels are cocked to one side.

In my limited experience, I have found that sand driving is all about maintaining momentum.

When I need to traverse long stretches of soft sand (and I mean REALLY soft sand where the tires are slipping significantly AND I am digging in a few inches, or if I need to go uphill in soft sand without a running start) I drop the pressure until the tires fatten a little. It helps to have a wider footprint. It also helps to have bigger tires! DUH However, you don't want to lower the pressure too low where you risk losing the bead of the tire on the rig. You'll have to put up with that annoying tire pressure sensor for the whole freaking time though. Does anyone know how to disable that one? I carry a little digital tire gauge and a simple 12 volt compressor, so I can return the tire pressures to operating levels on the pavement, otherwise it is dangerous. I wouldn't recommend dropping the pressure below 20# at the extreme lowest and return to at least 30# for pavement.
Other than that, jusy be aware of the environment. Nice big stones just love to hide under seemingly soft, fluffy sand. So do logs, rebar, concrete blocks, mini coopers, etc!!!

Have fn and please post some great pics of your trip!!!