Do you see other larger (14K-15K lb) FWs on the beach, in the area you want to go? If they are towing in the sand, with SRW trucks, you likely can also.
If you weigh your trucks rear axle, ready to camp, plus hitch, full fuel, and passengers, you just need to see what is left for FW pin weight, after subtracting your scaled rear axle, from your truck's RAWR.
Example: truck rear axle weighs 3,350 lbs, and RAWR is 6,350, you have 3,000 lbs left for pin/hitch wt, before going over RAWR.
BTW...welcome to the forum!
Jerry