I think i would steer-clear(no pun intended!) of the wheel-type.You have to keep in mind the extra pounding its' going to give your cart and rv.Even though they are sprung,they will be minimum help,more than likely.A good,mounted carrier,i think will be a better option.Just make sure your hitch-frame is meant to carry weight other than a bike-rack.Some of the rv rear-hitches are meant for bikes,etc.. and don't have much weight capacity,even though they have a class-3 receiver-tube.They mount them to minimal framing underneath and trying to hang close to 1,000lbs. could become a problem.I've worked on a lot of the larger Diesel-Pusher RVs'(38'-up) and some had a hitch i wouldn't hook a bicycle to.Hope this helps.
