Back when I was driving over the road, lug centric wheels were the industry standard for a large majority of the big rigs. We ran either 20" tube type wheels, or 22.5" tubeless. If a set of duals on a rear axle could handle 8500 pounds at each hub, I doubt if your dump trick would have much of a chance of causing an overload. Steer axle max weight was 12K pounds for a pair of single wheels, and it was not uncommon to run heavier loads if the scales were closed. Of course, the lug studs on those rigs were 3/4" diameter, capable of holding up a bit more weight than the smaller diameter studs you'll find on a 5/10 lug setup like a 1 1/2 or 2 ton stovebolt chassis.
Jerry
