GMAN,
The model number of the ROLA is 59500. Price is $140 at etrailer.com. Description states from the pin hole in the tube to the front edge of the tray is 10". If your camper is on your truck,measure from the pin hole back 10" and see if the tray will clear the back of your camper to your satisfaction. As you stated earlier, a foldable model may allow even more clearance. They do make a foldable model also. A couple of qualifications. One, my cargo carrier is 6 or 7 years old. That said, the picture and description on etrailer looks identical to mine.