Look at Etrailer.com and type in hitch cargo carrier for many options. I had one for several years and added tail/brake lights(kit) as well as a locking container that I attached to the cargo carrier. Mine was rated at 500 pounds which made it very strong. When I sold that coach, I sold the cargo carrier/box set up. I was able to add storage space with the large locking box. Reese makes a good one and I believe it is under $300 for the cargo carrier (box not included). I just remembered the brand I had was Rolo.
Paul
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