[RMcNeal]

Joe, if you can keep the inside of the coach in the 60's and can either run heat pump or fan on low to circulate, you may be ok. I have the "4 seasons package" on ours. I run heat pump, fireplace and a small ceramic heater and it keeps the basement in the upper 40's to low 50's. The heat pump isn't really doing much at 19 degrees but circulating the warm air from the fireplace and other heater. I've been down to -5 with this and have been ok with no pipes even close to freezing. Just have plenty of clothes :-).
My plan B is to run additional electric heat off the washer/dryer circuit since I don't have either installed and they are 20 amp circuits.