Many years ago our CFI gave us his thought on this. If it is a case of just getting the plane in and out of its own hangar arrange tha hangar floor to have a slight slope so that the plane will roll out. No need to even thing about a concrete floor, just three rows of paving slabs to suit the undercarriage of the aircraft. Then have a winch at the back of the hangar to pull the aircraft in and it just rolls out. He was talking in terms on a hand operated winch.