Don't Even Think About It...
Short Answer: Don't even try to put an Overbilt-type lift on a 45.
Longer Answer: (If you actually know something about this or are technically minded, please don't read this) Art Boice, the guy who designed and built the original lift put one on our Angola, which was a 40-ft XL. What he did was remove the center rear bumper and weld an 'H' frame across the really big engine beam dealies. He then built up a mount for the lift, then attached it. I had a Valkyrie, which is a pretty heavy bike and a tow pack to pull the Saturn. It was a great deal and worked very nicely. After the Valkyrie did its acrobatics, running into a State cruiser in Maine a number of years ago, my interest in bikes waned, and so too, did the lift thing.
I asked Frank Konigseder, Jr., at Liberty about the possibility of putting one on our XLV camper and he said something like, "We see a lot of them come in here with rivets pulling off the rear cap from the lift." He then said a bunch of stuff that I didn't understand about how the Series 60 is mounted differently on the frame of an XLV than an XL. He also said, "If you are determined to put a lift on a bus, make sure it's a 40-ft XL, perfect for the application."
This came up on the prevost-stuff board awhile back and I got scoffed at for making the above remarks.
So, people should do what they want to do with their buses. It worked on the XL, but knowledgeable people looking at the very same problem came to the same conclusion that I did: The frame is different on the XLV 45 than the 40-fit XL; furthermore, there is a different engine mounting system.
When a guy hangs an 850-pound bike about 10-15 feet behind the drive axle, there is a lot of leverage there and a guy would want to make darn sure that the lift is not going to wreck a very important part of the camper.
My 2 cents worth.