I installed the Hunter digital thermostat yesterday. It was a pretty easy modification. After shutting off the battery to the Elkmont:
1) Take cover off the old thermostat
2) Remove Red wire from top contact, White from bottom
3) Remove old thermostat with 2 screws
4) Install backing plate of Hunter thermostat on wall
5) Terminate White wire to "W" terminal, Red to "RH" terminal
6) Attach face plate to backing plate
7) Install 2 AA batteries
8) Turn trailer battery back on
9) Fire up the heater
Here are a couple of finished installation shots of the new thermostat:
I will report on how well the new thermostat regulates the heat once we use it camping.