All you have to do is check the axle boots (swing axle) and top up the gear oil then you can tow it as far and for as long as you want.
My uncle towed a 68 Beetle from Vancouver to Mexico and back, 9 times. No ill effects whatsoever.
Don't try to back up, you can't.
For 69 and later cars with steering locks, key in, turn on to unlock the steering, then key off and leave it in the ign switch.
Trans in neutral.
Don't forget the safety chain.