[busterbrown]

Not much weight at all, to be quite honest. Do an internet search of "RV bumper failures" and you'll see tons of pics and videos illustrating the aftermath of a failure.

When loaded, bumper mount hitches put significant stress on the thin sheet metal that forms the actual bumper. It's not necessarily the welds of the bumper that fail, it's the sheet metal that cannot hold up to the violence of 65 mph high-speed travel.

As far as a weight, I'd say as much as a spare tire and swing arm BBQ weighs. And that's it. If your planning on securing 4 bicycles to a bike rack carrier or mounting a loaded cargo carrier to "bolt on" bumper receiver, you'll be pushing the limits. It's more appropriate (and safer) to have a receiver hitch fabricated and/or welded to directly to the frame rails.