Lee,
The driver side box is mostly black water and gray water supplies, (gloves, connectors, a towel, RAID, gray water hose etc). In other words, wash hands after opening.
The passenger side box is setup tools, stakes for the
awning, hammer, level, chocks, jack wheel,
awning knobs, a huge screwdriver, water pump pliers, ball grease.
I got the idea from a trailer I saw at a
rally, a guy had mounted a huge rural mailbox in front of his
propane tank. This mod would not work on mine, because it seems few
Casita tongues are alike, and a commercial tongue box would not fit either, so I used 2 standard size mailboxes.
Ed F