I am the OP. We have been traveling and away from the computer, but I wanted to return to this thread to confirm what my problem was determined to be.
I was able to use my main 50 amp power cord, my 50 amp extension cord and another shorter, higher gauge extension cord in my garage to reach from my fifth-wheel to my house's nearest outlet. This solved the problem with the EMS clicking on and off due to low voltage as the voltage coming into the EMS was now above the minimum requirement of the EMS.
In the future I will have to either cobble together these three cords or just buy a new, long, higher gauge cord for hooking up the RV in front of our house.