Rolling storage platform

Our Fuzion 429 has a sleeping area (?) above the entrance doorway between the garage and the main living area.  One of the A.C. units is mounted up there and that's why I can't imagine anyone trying to sleep up there.  It is a cave.  We use it for storage.  However, it extends probably six feet or so from the opening and a person would have to crawl up there to reach anything.

So I devised a solution.  Cut some simple platforms (I use two) out of 3/4" plywood that are nearly as wide as the "cave", put wheels on the bottom, and foam bumpers on the edges.  Attach a simple cord to the rear one (so when you pull it, it pulls both of them toward you), and you have a rolling platform to put whatever you want on it.  We have a large suitcase containing guest bedding and one of my big loudspeakers that we store up there.