I tried backing a Jeep Wrangler on a towbar ONCE!
The towing vehicle was a Dodge 3500 dually with an 11.5 foot camper on it.
I will NEVER do it again!
I backed straight back about 5 feet when the front wheels of the Jeep SLAMMED over against the stops quite violently. IMO, if somebody had been sitting there trying to hold the wheel they just might have suffered severely sprained or broken wrists.
My recommendation, based purely on personal experience, DO NOT TRY IT!
THE SAFEST WAY IS TO UNHOOK THE TOAD!
I don't care how many people say they have done it, I will NOT do it again.
By the way, I am no novice at backing things. I used to put DC-6 aircraft in hangars, with about 6 to 10 inches of clearance on each wingtip, using a short nosewheel (double swivel) towbar. Same thing with a DC-3C using a quite long tailwheel towbar. (shorter wing span, so more wall clearance).