When you are wheeling over a few feet of snow, and your tires are nowhere near the actual ground, airing down is imperative so you float over the snow. This was a very common occurrence back in Northern Idaho where I learned how to wheel. Ground clearance was not an issue, but if you tried to hit it with fully inflated tires you would be stuck in a matter of second. We used to go with a few old CJ's that were stock, a Jeepster commando that was stock, an older bronco with 33's a couple 80's Toyotas running 35's and 2 full size Fords (1 78 F150, and my 79 F150, both running 35's) and the first thing we did every time we got to the wheeling site was air down for a bigger footprint, even the guys in the stock CJ's and the stock Jeepster.

Sean