I saw a video the other day of a type of anchor that works great for soft sand. Its a square of fabric with straps anchored to and you bury that in the sand and tie off to the exposed straps.
here it is:
YouTube
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2014 4R SR5 - 3" Dobinsons, 285/70 Wild Peak AT3, RCI Skid & Sliders, CBI Bumper, Firewire light bar, Diode Dynamics Fogs