We learned this trick from some Canadian friends who we met at Brazos Bend State Park one winter. This small electric heater puts out a good amount of heat for its size. It keeps us from having to run our propane furnace, and turns itself off immediately if it gets tipped over. It has 3 settings: flame (no heat, just ambiance), low and high.
We've owned an earlier version of this GPS (the Rand McNally RVND 7720) since 2014. You enter information specific to your RV (height, length, propane) and route preferences (tolls/no tolls, highways/back roads) and then select a route from two options. Our favorite features: (a) campgrounds and RV parks are already loaded so you don't need physical addresses, (b) the fuel log tracks MPG, (c) includes unlimited map updates, (d) you can select points of interest to be shown. Please note: no GPS is 100% accurate. We use our phone map and paper road atlas as back-up.