When we picked up our New Aire in late January, and "moved in," one of the first things I noticed was that it was hard to keep the cargo compartments organized. What became clear was that we have too many flat things (ladders, folded rugs, etc.), and once one flat thing went on the floor of a compartment, everything else on top became a jumble.
After ruminating on it for a while, I decided what was needed was a vertically-oriented storage space. I used shelving board to construct a divider system in one of the pull-out trays that has really made a difference (see photos below).
It's an idea, in case anyone else is having the same situation (New Aire or other model).