Quoted from Deez:Why not spend the money on a gym membership? A healthy grown man with no disabilities should have no problem moving a pinball machine up a set of stairs with a standard dolly. I had one person use an escalara when buying a machine from me and it seems like way more of a pain in the ass to move and position that akward dolly than to just pull the game up my 5 steps manually. I've moved tons of games up and down stairs and never had an issue and I'm average sized at best.
Give it a few more years, your back will be messed up for the rest of your life and your future Chiropractor will be a little richer.