I used the roll/pivot idea to build this rocker to help to move games between the floor and a horizontal surface.
Pinball car dolly 2 (resized).jpg
The idea is that the rockers have a radius that matches the height of whatever vehicle platform, table, dolly, workbench you need to get to. I made two sets of rockers for two different vehicles.

From the vertical position you just push it over to the horizontal position where the end of the rocker can rest on the edge of the vehicle, workbench, whatever. Then the game can slide from the rocker to the next surface. Pushing it over from the vertical position is much easier than lifting it. It works in reverse for unloading too.

The rocker is held together with threaded rod and can be knocked down flat except for the angle bracket on the bottom.

I've used it a couple of times but not as much as I expected to.

/Mark