Interesting that the 811 fully loaded is at 4200 lbs. which is 500 lbs. more than my Lance 845 which was my load limit for the camper portion of the payload on the truck. Add a trailer's tongue weight or even a couple extra passengers and load will be over 4500 lbs. which is pushing it. Adding extra suspension items like Supersprings or an anti-sway bar also adds to the load carried by the tires.
With my 17" rims only the Toyo and Nitto Terra Grappler tires provided 3750@80 PSI load capacity. I would have had more choices with 16" rims which are a more common size used on commercial trucks. With 20" rims I would have been SOL.