Trailer info would be helpful to correctly guess at a diagnosis.
Possible water heater is still on bypass or if newer the hot cold mixing valve.
Very true. One other detail could help, is cold water coming out of hot side of faucets or no water? If no water could be just one of the winterizing valves was not turned.
Is this your first rip out this season and first time using the hot water. If so it may take a little time to travel thru the pipes. Other than that be sure the hot water shut off value is in the correct position.
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