There is a you tube video that shows some Arab types stuck on the sand with a Mercedes saloon, no winch, no 4wd, no other vehicles, first they fill a sack with sand, then they bury it in the sand after tying on a long flat ( 2" wide) strop , then the clever bit, they looped the strop onto one of the back wheels then tied it on through the wheel with some small diameter rope, then drove it, the wheel turned and took the strap and the strap gripped the tyre like a winch, after a couple of turns it went tight locking the strap onto the tyre and very neatly winched the Mercedes backwards out of the soft spot of sand. They weren't in a hurry either, but got neatly out of trouble, this might get the grey cells working on other solutions in this type of predicament, you can of course when solo froading think about a rear winch, a tirfor, and maybe a simple ground anchor, although something about closing barn doors springs to mind. All the best, Bill Westley