I looked through old posts and found good advice on moving pins. I've got 2 coming soon, hopefully in time for Christmas (come on Santa) I've only got room for a couple in my basement so I can imagine trading and swapping them out every so often so I'm looking for specific advice on buying the best dolly for the job. It's straight down to my basement, 6 carpeted stairs. The rest of the trip is flat with only 2 lifts over the patio door opening and the garage (man) door opening. I'd rather spend a few extra dollars and get the right dolly than drop or damage one or hurt my back. I see there are 'lifts' than you slide under the machine but aren't these a problem on stairs? Thanks.