I regularly ran my previous truck - same wheel and tire combo as this one - throughout the sands of the OuterBanks North.
I always dropped them to 14PSI just prior to heading into the sand and never got stuck or any issue at all under all conditions. I always carried a mobile 12V compressor [VI-AIR 450P Automatic Portable Compressor] to restore the tire pressure following the fun. I still have it. Pricey but brilliant!
link may give you some pointers..... and please remember the tow straps.
Hope this helped.