jefe here. Fun vids. I've not been on this site for 6 months. Sand. I've been a sand dog for many decades, first in jeeps (small j) and currently in an old Dodge Cummins with a small Lance hard side Camper. We go looking for beaches and dunes to run. Freedom has the numbers nailed, but there is more to it than that.
1. There is an infinite variety of sand types from bottomless dune style blow sand to hard pack beach sand as at Pismo. It takes experience to 'read' the sand, which can change in a few feet, and find the perfect tire pressure for your ground pressure. Ground pressure? The amount of weight spread over the aggregate size of the footprint. A tall sidewall is helpful. An 18"-20" wheel and sidewall free tire does not air down well. Also, any, ".5" wheel and tire arrangement (16.5/ 19.5) is to be avoided unless they have double bead locks, like the hummers. That'a why I still use 16" wheels, 35" tall tires that have a lot of sidewall and still carry a hefty 3860 pound load, per tire or 7720 pounds per axle.These are on very heavy duty custom made wider steel wheels. Really wide tires can be run at a lower pressure than narrow ones. On a standard truck tire hauling a camper I would not go lower than 20 pounds unless your life depended on it.
2. My only advice is to equip yourself with a way to deflate in a hurry and be ready with some sure fire way to re-inflate the tires. Cheap China Freight compressors are not even worth what you paid for them. I use a 20 pound CO2 tank with the correct plumbing for the freeze that occurs, and a small 12v compressor as a backup. You know, the most fun we ever had was when we were woefully under equipped for the terra at hand and just found a way to make it work. So, jump right in and make your own mistakes.
Once Faux-bucket dropped their hot linking, I've not been going to the TC or XPortal sites at all. Too bad. A lot can be learned from pix of the specifics. That's gone. We're still planning our
'around the U.S., clockwise, 16 week, Sept. 1st to New Years day, staying within 200 miles of an international border or ocean and camping ON as many beaches as are allowed', trip. Probably 2 weeks camping near DC and taking in the 'leaf peeper' season in the NE. Once a week we'll check into a high-bucks hotel to freshen up.
We've already had our 10,500 pound TC on nearly every beach that's legal on the west coast and AK. We've done a lot of dune running. It's a sight to see the 5 ton rig 'shoot the bowl'. But my fave is that campgrounds are optional. We've learned to overnight in city scapes and countrysides alike with no visible means of support. It looks like no one is home. It's kind of a game.
Good luck.
jefe