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Is it possible to buy small freestanding cranes? The problem I am trying to solve is that my house has a lot of storage space on the (flat) roof but I don't want to keep carrying my bikes up through the house. I am looking for basically a shop crane to hoist my bikes up the side but the problem is that all of the ones I see (shop cranes and engine hoists) have a long base in front that will butt up against the wall around my roof.

Looking for suggestions, if anyone has any.