Sometimes (most times) friends seem to be "unavailable" when you need to carry a machine up from the basement.
I'm too much of an out-of-shape weakling to use a dolly by myself and tried an Escalara once... was not comfortable with it.
So I went all redneck "Hey honey, hold my beer & watch this!" in designing a system.
I already had the Harbor Freight electric winch (700lbs rating). Mounted to two 2x6's nailed together, and then laid across a doorway opposite the stairwell.
Made two 2x6 channels, connected by 2x4 cross-members, which also keeps the assy from sliding down the stairs. It's all screwed together, so it can be stored away when not needed.
The "sled" has 2" rubber wheels that ride in the channel tracks. It has a steel L channel bracket that the back of the machine rests against. Plus the wheels allow the sled to be rolled around as needed.
I'll refine the design down the road... but for now, here was a video of bring up the first machine. (ST25 prepping for Expo)
(yes... I know I'm lucky to have straight-shot stairs, wide open landing and doorway directly opposite.)