I'm another one that has gone from a MH with a 158" wheel base to the current one with a 220" WB, and about a 12' overhang behind the rear axle. I don't believe I've ever thought about backing in anywhere before I got there, and what the "right way" is to do it. If I make it in one maneuver without pulling forward, that's fine. If it takes a 1/2 dozen attempts going back and forth , that's fine also - it is what it is. I just go slowly and cautiously. Haven't hit anything yet in 2 1/2 years with the "new" MH. :B
The only thing that has ever bothered me with the longer wheel base is the additional room you need for a U turn. In many places it just can't be done.