There is no doubt about it. Truck campers are heavy and most of us are probably close to the load capacity of our trucks. When it comes to load capacity, the limiting factor is often the tires. I k...
Having double the actual load for rated capacity seems, how shall I put it, completely overkill, and virtually impossible to accomplish on a srw truck with 4tons over the rear axle. You should not expect to have issues loading good tires up to or even a bit over their capacity.