Caulked in the back side, this is kinda a "wet room" skis, ez up sleds etc. That should keep the water from running under the floor into the living space. There is a fair bit of storage back there, but I wish I had made it 1" deeper....
Got the inverter mounted, and the hot side cable done. Man everything takes FOREVER! Climb under bed, forget some little piece/tool, climb out, walk to garage, climb back under bed. Repeat ad nauseum.