There aren't the same type of manufacturer restrictions on cargo carriers at the rear of travel trailers as there are for bike racks. That said, I do recommend ensuring the best possible stability, and if you have a 4" x 4" or 4-1/2" x 4" bumper on your travel trailer, use a cargo carrier designed specifically for that, the 24x60 etrailer Cargo Carrier for RV Bumper # e99049.
But if you were instead wanting a hitch-mounted cargo carrier, I highly recommend going with a non-folding carrier... view full answer...