Well thank goodness no one here is obese nor are any friends cause they floor joists are one octave away from the fat lady singing!
Due to the 4 wheel dolly's 3 inch height the back-stop slate slab had to be tilted to clear the doors
Due to a small crack 1/3 the way across, we used a durarock sheet as a back board during moving and placing.
As a "lean-against" rear standoff/insulator I figure these old glass electrical insulators should do fine. salvaged from an old steel mill abandoned supply room i was poking around in..