Not finished yet but we decided that we needed a bit more storage space, we decided that we didnt want a proper head banger unit so have added this which seems to be working well.
Nice idea. We don't use our top bunk in our Westie, so we have removed the fold up portion of the bed and the mattress from the rest of the bed and there is space up there for storage crates that stay there on the move (a small bar holds them in from sliding forward when we brake) and even more space to dump stuff when the roof is up.
Very nice, but you can almost certainly empty it by braking hard .. probably needs some brown netting to cover the front edge, hooked up above.