Reading more of the posts, the composting toilet does away with unwanted mountain formations.
I'd say, try all the stuff out in your driveway first, familiarize yourself with the systems so you can just flip them on when needed while camping. I found this particularly important for the heating. The rally idea was brilliant too, you can learn sooo much from others that way, camping with other 'streamers for a few days. No one will ever know as little as I did when I bought our trailer, or will be as unprepared as we were our first trip. Nevertheless, it was super fun, even if the only system that worked was the power. Icebox, campground facilities for everything else, camp stove for cooking, jugs for water. We had awesome food, wine and the company of the others at Casini. I did have the interior reupholstered so the beds were comfy.
Wherever you go, there you are