I have a snowmobile too. I put down plywood by the garage door and ride up and stop with the skiis on the wood. I then slide small wheel dollies under the skiis. I lift the back as I move farther into the garage then slide another dolly under the track. Works for me and I don't need to worry...
The only problem with hanging them sideways is finishing all the **** joints. I hang sideways in small rooms and prefer factory joints for finishing in bigger rooms.
Using the lift for walls looks like more of a PIA than its worth. Lift by hand and bang 'em out.
I just bought one of the red lifts to finish off my garage. It worked fine.
Check out this link to another forum on the subject.
http://forums.jlconline.com/forums/showthread.php?t=32341