Carrying an Arctic Fox 811 will be within your tire capacity, but it will require a 28" SuperTruss and the 500-750 lbs of tongue weight will take you into 19.5" wheel capacities. I did this successfully with my F250 and a heavier trailer regardless of the nay-sayers on this forum that are contrary.
The problem will be that 19.5's don't have flotation for loose sand use. You either need to find a truck camper that weighs 2500 lbs dry so you can tow the trailer and stay with your current wheels or switch to the OEM wheels in sand with only the camper and only tow with 19.5's swapped in.