I made my own for our "B". It's not pretty by any stretch of the imagination but it sure is functional. Up there we carry a small Vacuum cleaner, small fan, 1.5 cubic foot 110 volt Freezer, one bag chair, a shoe box for personals for each of us, snap on front window cover, A bag for each with shower stuff if we use the park facilities, a couple of empty boxes for extra food if needed, and some more misc. stuff.
The RV had an upper bed that slid out for full length sleeping so I left it in and secured it with screws, then made Plywood dividers to suit out needs. If those needs ever change I can easily modify it as nothing is permanent. I carry a 3 foot broom handle, wooden, with a notch in one end to pull boxes out that I cant reach. I can use that same broom stick to slide a box in behind the freezer.
