Since I woke up this morning to freezing temperatures (my Weather Channel app says it was 30° here) and the RV heater eats up propane, I decided to get a ceramic portable heater.
Ceramic heaters give off more heat than do fan & coil portable heaters. I checked Walmart's website on different ceramic heaters and saw one that I liked and the price was right.
Luckily, there's a Walmart about a mile from the campground, so I went there and selected a Comfort Zone Multi Purpose Ceramic Heater. It was under $20 and I am trying it out tonight.
So far, it is nice and warm inside The Beast. I think Sierra and I will be more comfortable tonight and tomorrow morning.