An alternative to the electric water heater option...
Escape offers a $200 option for electric water heater in addition to your standard propane water heater. I found this interesting set up for less than $50 for instant hot water at your sink.....https://www.amazon.com/Tankless-Elec...BFQQ63Z2VWP139
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Jim
Sometime life gets in the way of living.......
This can work... but it uses over 20 amps and so none of the trailer's circuits are sufficient. Even if provided with its own circuit and breaker anything else of significance running at the same time would trip the trailer's main breaker or the campsite's breaker (at 30 amps).
It appears to be unregulated, so the heated water temperature will depend on both incoming temperature and flow rate.