He can use other brands of tow bars, adaptors are available to use most any baseplate with any towbar.
I have used a Roadmaster Stowmaster, the type of tow bar that folds up and stays on the Jeep, for a 100,000 miles of towing.
Most RVs today use a tow bar that stays on the back of the tow vehicle's rear hitch.
https://www.etrailer.com/faq-towing-a-vehicle-overview.aspx