Of course the absolute answer is unknown because at some point you will get high centered on the frame and then you have to dig. But to move in the sand you have to let the air out of your tires down to about 8 PSI. They will stay on the rim if you don't get crazy doing donuts or side hill runs. I have been all over the dunes in both my '94 Bravada (full time 4WD but no low range), and my 98 ML320, both of which have rather mild Michelin Cross Terrains on them. But boy do they grip when you let the air out to 8PSI!

Remember to keep your speed below 40 on hard surfaces until you get aired back up.

Anyone who has ever seen an Oldsmobile at the top of Oldsmobile Hill, a giant sand dune at Glamis, knows it was mine! Many, many 4WD trucks cannot make that trip!

Jim in Phoenix