I will agree with the extra electric heater. That way you are using the campsite electricty and not your gas. We were lucky that our V-Lite came with an electric fireplace and we use it alot. We seldom have to use the gas furnance since the fireplace will heat the trailer most of the time and we also bought a small electric heater for the bedroom for the nights when the temperature got too cold.
Freddie & Linda
2015 Forest River Sierra 330RLS
2003 Dodge Ram 2500 4X4 Cummins Diesel
Days camped for 2016 - 46
Days Planned for 2017 - 118