We keep most of the same stuff as Bruce and Jackie. I've got all my hoses and extra cables in a canvas bag. Also, I keep my solar stake lights and the side walls and screen walls for the 10'x10'.
Its not the easiest thing in the world to get stuff in and out, so mostly things that don't get used every day.
If think the two larger compartments will fit the tire, and the other two are a few inches smaller.