We use the Hyperax Volt RV on our 3791RD. It is approved for fifth wheel RV use with a hitch receiver - not mounted on a 4" square bumper. It handles two 70 pound bikes - ours are 65 each. My only disappointment is I can't pull the rear tray out all the way with the rack installed. It is sturdy and the bikes look pretty secure in the rear camera as we travel. Pretty happy with it. Purchased from Amazon
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