This item is currently out of stock.
Plenty of RVs have a square bumper but no receiver, which rules out bolt-on bike racks and cargo carriers. This adapter clamps directly to a standard 4" or 4-1/2" square bumper tube and turns it into a usable 2" receiver for those accessories.
It ships with the zinc-plated hardware needed for installation, though some assembly is required on your end. Keep in mind this adapter is built for accessories only - it's not designed or rated for towing a trailer, and it shouldn't be mounted to decorative aluminum bumper covers.
An easy way to add cargo capacity to an RV bumper that wasn't built with a receiver in mind.