You could make the rails from wooden 1x1 screwed to plywood bed and run the trucks between them rather in the manner of the Montreal Metro. You make the trucks from plywood or MDF with large non-swivel castors mounted on for wheels. The furthest one away has a stout rope attached to it. To load tat into berging simply add a truck, then pile on tat. When it is full, push the truck down the track and add another. To retrieve tat, pull on the rope to bring trucks back up the line.
Mind you don't make your house fall on its side with all the weight though. You may need to counterbalance the house with lead shot in the gutters.