No I haven't had any issues but you have to remember a scooter is back heavy not balanced to the center as a motorcycle is. If you have an extended frame to the rear bumper you could have a welder weld a tee across the bottom of your hitch and then bolt it to the frame of the RV. I had my welder add 2 2" square tube extensions from the hitch to the the receiver portion just behind the pin hole at a 45 degree angle because of the close weight tolerances.
Mine was a 350# hitch and my scooter weighs 300 and the rack about 60. I also have a spare so I run a nylon strap around the hitch tongue up to the spare tire rim.
Make sure your hitch is bolted to the frame, not welded, welds can crack and break.
You are marginal especially with the weight of the scooters being off center. One good whoop de do might be an aw ****.
2004 CRV TOAD/1990 WRANGLER TOAD ROCK BUILT