Ground clearance depends on speed and the depth of the ruts your driving in, going too fast causes the the jeep to bounce. That causes the undercarriage to bottom out repeatedly. That's what really causes the large sand deposits underneath. I've found that with low tire pressure you can drive much slower, eliminating the bounce and causing almost no sand to collect underneath. I've also made emergency runs on sand before, had no time to air down and had to get to a certain part of the beach ASAP. The jeep fought thru the sand rather than rolling on top of it. I will never do that again. Probably took a year off of the life of the transmission. Not to mention the huge amount of sand the tires threw up into the undercarriage because I had to drive at a higher speed to avoid getting stuck.
Long story short-
Low tire pressure, slow and steady gives you the max ground clearance.
Sent from my iPhone 4s using Tapatalk