After reading some of the postings on this thread I was thinking about somehow connecting a 2nd EMS readout outside, but then I got to thinking about my space arrive/departure written checklist steps. I always turn off the mains circuit breakers on the inside panel before disconnecting the shore power cord next to last thing before departing; upon campsite arrival I hook up and energize the shore power connection, then go inside, check the EMS readout, and if all is good flip on the mains circuit breakers. If anything is wrong with the EMS readout numbers the EMS should not pass the power thru its main relay, and I would NOT turn on the trailer's mains breakers until the power was good. I follow this routine mainly to reduce arcing wear on the EMS power switching relay (this way it switches with no trailer electrical load on it).
I use my inside EMS readout many times each day, especially when on 30 amp power, to prevent overloading and tripping the 30 amp campsite pedestal circuit breaker. Just this morning I had the microwave going, the induction cooktop, and the toaster. I looked at the readout and saw that this put me over 30 amps and immediately switched off the toaster before the pedestal breaker could trip (saving me a trip outside in the cold early morning fog here). Luckily, there is a short overcurrent time delay in the circuit breakers before they trip.