Then I thought about making the bin at the rear of the shed. 8'-5" wide, 4'-0" deep, and 4'-0" (3.3 tons). If I built it this way and created a removable section of wall in the front/center of it, I could roll the wheelbarrow into it and dump. When it fills up a little, I make a little ramp and dump some more. It would get to a point where I wouldn't be able to dump the wheelbarrow anymore, so I would have to shovel it in or come up with another idea. I could make the bin 6" deeper and 6" taller and add more coal to it too (4.25 tons). I do need room for the lawn mower, snowblower and other essentials.
I would add plywood to the interior of the shed for the bin to strengthen the walls and also add a hinged lid that I could use as a shelf.
I know the tool rental place down the street rents "dirt conveyor's", so I was thinking about seeing if one of them would work.
Any tips or ideas?