I made this gantry crane so I can move stuff around in my 14 x 20 shed. Put 2 I beams across the top plate and then welded 1/2” plates on each end of the main beam to hold the trolly. This is the best thing I did for storage so far. I put a half ton air chain hoist on a trolly and can move stuff anywhere in the shed.
Made a bracket to pick up the snow blower and hang it on the wall for the off season