SandSled/4wd question?

[C-5 CC]

I have a 2002 Suburban and I have gone thru some heavy deep snow using 4 auto, and I have had no problems. Granted, I haven't taken it in the sand, and probably never will (the wife would kill me...it's HER truck) but I like the 4 auto.
Ditto on airing down. The first time I went on the beach w/ MY truck (2002 Chevy 2500HD) I got real nervous seeing how low the truck was sitting w/12psi in all the tires. I thought for-sure that the tires were going to just fall right off the rims. Everything went just fine, the truck was like a tank, I even did like BM said, and ran in 2wd lots of times. I couldn't believe it, but it even made it up that wicked hill on the Race Pt Ranger station southern access road in 2wd.
Good luck
Brandon