I have a sliding aluminum tray that will slide out of the door on either side of the fiver to nearly half it's length, and will hold roughly 200 pounds at full extension (added this option as the trailer was being built). On the curb side are the folding chairs/tables, BBQ, wiener forks etc.,and on the other is a hose reel with 100 feet of water hose on it, space for my shop made tire chocks,some of my tools/supplies in a plastic tool box,extra electrical cords etc.
On the floor in front of the tray and reached through the curb side door on the front of the basement area are my sewer hose connecters in empty cat litter containers with tight fitting lids ,portable air compressor, bag of wrenches/pliers/screwdrivers, axes, camp fire tools, larger folding lounge type chair,rubber boots, spare oil/anti-freeze/washer fluid, broom etc.
Under the sliding tray are my patio mat,case with my socket wrench set,spare tire crank handle, and whatever else is not used much but needs to be out of the way.
I welded up a basket that holds 3 empty 5 gallon water carriers, and that is screwed to the frame under the bed area and well up above the storage compartment floor. This works well as that space was just dead storage, and not readily accessible as it is in behind the propane tank compartment.The containers are easily slid in the front of the basket and held in place with a rubber strap across the opening, although they would likely stay put without it.