It is NOT the "wiring" dammit. You either did not read my answer or you do not understand the concept. Allow an unfused potential which is a hot neutral reversal to enter the circuit.
You believe the 50-ampere breakers inside the coach are going to "protect" an unfused circuit rated at 30-amps?
You are assssssuming there are no neutral faults ANYWHERE in an older rig.
The issue here is recommending a design change that can cause an overload for which there is ZERO protection. Two faults: Hot/neutral reversal and neutral ground isolation fault inside the rig. Coupled with the fact that the only remaining safety is a rig master breaker rated almost double what the service can safely withstand. If the rig had a 30 amp master it would be a different ball game.
The poster is not a techie..
None of what I wrote in the postings above was explained by responders here. Not even load managementand the ramifications thereof.
Yeah this leaves me a little cranky. You people assumed the rig has proven electrical integrity. You folks assumed the power post cannot have hot neutral OR neutral ground reversed.
As an E.E. I am forced to encompass ramifications of ALL TOO COMMON connection faults. Yes this can happen with a 30-amp power post. But this has a 50-ampere potential.
Grumpy grumpy. Stick a 30-amp breaker between the RIG and the SPLITTER and make me a happy camprr.