It's simple folks.
50 amps is a limitation...the camper may draw up to 50 amps...at which point the circuit breaker will trip.
The thing that runs his fridge and air conditioning is Voltage (pressure)... So with the a/cand fridge turned on...measure the voltage in one of the campers outlets. If it's normal...then that's not the problem...there would be significant loss over the line if the wiring weren't capable... If the circuit breaker is tripping...you can use a clamp meter to measure and record the peak amps...or simply swap breakers to make sure you don't have a weak one. Anyway, if his coach is tripping the breaker I would check for normal voltage... When voltage is low...the amperage draw goes up so the load can get the required watts to function. If that's normal...then the load in his camper is too high... IE maybe his compressors are going bad and pulling too high a load.
