One thing I’ve learned about soap is that it always leaks out of the container. Probably more so when going through drastic elevation changes like my popup camper often does. An easy solution is to store all of these items inside a plastic container and place that container inside the sink pan.
After installing a 12 volt outlet inside my camper, I use a battery monitor that plugs into the cigarette lighter style power receptacle. This allows me to conveniently monitor available battery charge without crawling under the slide-out bunk, opening the battery box, and checking the battery directly with a multimeter.
Dual propane tanks can be a nice convenience for all popup campers. Even if you can complete a camping trip on just one tank, having two tanks with an automatic regulator allows you to not worry about filling up before you leave – as long as at least one tank is showing full. Two tanks can also be an absolute necessity when boondocking for longer periods of time.