Yeah, hard-packed sand isn't a problem really, even a 2wd vehicle can drive on that. It's the deep, dry sand that brings vehicles unstuck...Or more to the point gets them stuck. People plant their foot, spin the wheels and the vehicle digs itself down. Then comes the hard work...And if not done in time, maybe the tine too! I've done Fraser Island here, the worlds largest all-sand island...They lose a vehicle per week on average out there over an annual period.
There's a few rules to stick by and then there's no problem, although there's always stress.
I have a full off-road camper trailer. 130L water plumbed to the kitchen, gas plumbed also. 120aH of on board power, solar panels, hot water etc. It's pretty legit. Except when I shred tyres. Lol.
RE: Sand in the coffin