The only question you have that I have a suggestion about is lighting.
You can get LED rope lighting that both has a dimmer and the ability to change colors. Since you can get them in differnt lengths you could have a right and left or front and rear light or just one for the entire camper and light would come from everywhere instead of just one or two spots. Also being LED they draw relatively little power for output.
The bonus is you can get them for super cheap.
Darrell