If I were going to tow a car that old I would rent a car carrier trailer from Uhaul and get all the wheels off the ground. You don't need a wheel bearing going while you're towing it.

Car Model 1980 MGB LE

I know people who have done it successfully. Here are some other opinions.
https://www.mgexp.com/phorum/read.php?3,2283272

How about a hitch on the Midge and tow the rv!!!! (A little humor can go a long way) Have a nice day, Marv

Car Model MGA, MGTD