From the OP in post #11 "All of the receps in the camper have 4 wires except the microwave which is on it's own breaker." I believe the microwave will be on it's own circuit. As for the other plugs, one of them has to only have two wires, to be the end of the line. Just had a thought, do you have an outside plug somewhere? Have you pulled it out and checked the wiring on it? May have been leaking and connections gotten corroded. Just a thought.
As for the two that are dead, how can one of them not be the end of the line? Again, check the wires feeding them, Almost impossible for voltage to go though them and continue down the line, and the plugs not work, unless they are internally bad somehow.
By now, I would try to figure, from the bathroom plug, next closest plug, then the next closest, etc., and try to figure the chain. It will be the shortest way around the trailer, with the least amount of wire, plug to plug. When you find the first dead one, go back one plug and make sure it is feeding the circuit. Keep digging.
2012 Ford F250 ext. Cab 4x4
2002 Jeep Wrangler Sahara
2008 Yamaha V-Star 650 Classic
2008 Work and Play 18LT