Thought I'd resurrect this thread on driving in the sand. Just got back from the Outer Banks, NC and spent some time at the Cape Hatteras National Seashore with the Expedition. Overall, I was very pleased. I'm running 20" wheels with Michelin Defender LTX M/S tires. I aired down to 20 psi and was able to drive anywhere we needed to with a mix of hard packed and really soft deep rutted sand. Ground clearance was also fine and I didn't drag anywhere even in the deep rutted areas. I did trim my front air dam so that its even with the front skid plates, so not sure if the standard air dam would have dragged. I ran in 4A with the rear locked and didn't have any issues. The Stowaway hitch carrier worked out well on the trip, and was a good spot to keep recovery gear (VIAIR pump, jack board, Bubba Rope, Maxtrax, etc). Photos attached:
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nice stance on that expy!
outstanding performance as well, considering street tires.