Chasis Electrical issue - Wipers / Camera / Jacks won't work

You have no 12v - everything you mentioned in your first post requires 12v power to be on.

Open the door, find the light control panel, and turn the 12v switch back on (also known as the salesman's switch). While lots of things can go wrong, 9 times out of 10 it is something simple like this switch. You may have to look at the whole circuit since many motorhomes may also use a relay system in these 12v control systems.