Does your trailer have a 30A or 50A shore cord?
I think you might have a typo in your post. You said the maintenance person tested the 30A and it only had power to one post. A 30A RV outlet only has one hot line, it's the 50A that has two.
Your test process of turning off the inside breakers one at a time is a good one. Sounds like you have a defect in the water heater, or a short in the wiring on that circuit. If your trailer is like mine, the circuit that powers the water heater has no other devices on it.
On my 2013 25FBT, the water heater is right next to the breaker panel, so the wiring for the water heater is short and accessible. The top of the bed platform is a thin sheet of plywood that is held in place by maybe 10-12 screws, so it is not a big deal to take it off. Your bed may be like that also, though I don't know where the water heater and breaker panel are in the rear bedroom trailers.
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