I just had a really cool idea. Build a cart with a horizontal top. Have
it run on an inclined track which goes down into the basement and ends
in a pit in the basement floor. That way you can keep your machines
horizontal and not worry about them slipping off the cart, and just
slide them on and off at floor level. Just like the inclined planes
which used to move slate, canal boats, etc. Maybe it's not practical
but it would be great fun and your friends would love it :-).

Good luck. Moving machines can be a lot of fun. The more you have to
improvise, the more fun it gets.

Chris