Make sure and get one that has an actual ground wire on it since the camper won’t be grounded by attaching the socket alone.

The 26g fresh water tank arrived, and I am still snickering about the randomness of this upgrade.  It replaced the 21g from the factory for a whopping 25% increase in onboard water.  I stuffed it in place to trial fit and it friction fits as if I made the slightly larger space for it, which I did not.  It's slightly larger for more comfortable seating than the factory height.  Here's a picture.  The plywood back of the cushion that covers it actually lightly touches the top of the tank, plus it's shorter and allows more room behind it, and bonus - the weight of the water moves forward a few inches toward the axle and away from being suspended far back on the frame:

Good to know.  My plan was not to use a scrap of pine anywhere in this build.  Only Mahogany, Cedar, and the Baltic Birch structural plywood.  Now, doing Poplar drawer faces and a couple cabinet drawers.  Today, I primed about 65% of the interior, as well as the drawers. The rear window frames are out to be painted black like the one by the kitchen for a much more modern look. I even stuck the screws into foam and painted them satin black. Here's the primer going up: