Yesterday, I had to haul off some excess material from the Nissan dealership: 1100 lbs of sand. This is about half again my previous highest known weight, and the truck was just slightly squirrelly.
The most I've had on the hitch hauler was a pallet of wet 6' dogeared fence planks, which lifted one of the front tires off the ground. I had it removed and came back with a trailer. So I know the receiver (in the bumper) & the hauler won't break at least until BOTH front tires come up.