How to hook up a toad to an RV using a tow bar?

Unless you have very, very excellent depth perception and an accurate aiming point, a solid arm towbar is most likely a two person hookup.

As Blue Ox says, the towbar should be level to no more than 4" higher on the MH end. It should never be higher on the toad than it is on the MH for a very good reason. If it is higher on the toad, the front end could lift in a panic stop situation and make a mess of the MH rear fiberglass.