Way too many variables...
I'm guessing my van is lighter than most here at ~8k fully loaded, likely more like 7k when running around the dunes, but here's my own experience:
For gritty desert sand, 20 psi is low enough. For powder at the beach/dunes/silt beds, as low as possible is your best bet. On my 10 ply 285's, that meant I could go to 8psi before the sidewall would start to fold. My 8 ply 315's can only get down to about 10 before showing the same deflection. Now, I wouldn't go spinning donuts at those pressures, but it's good to know the low end of your pressure range so you can go straight to it if you find yourself stuck in a bad way. I generally start off at 12-15psi (if you pull the valve core, it will start to whistle at ~15psi, YMMV) single digit pressures are reserved for last ditch extraction efforts. On a heavier rig, 20psi would be a reasonable starting point.
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