We also use a Coleman catalytic heater to take the edge off. When we cold weather camp we bring our backpacking mummy bags and thermal.underwear to sleep in. I would not mind temps in the 50s especially if it is 20 outside. I have not cold weather camped in the Roo yet...maybe a trip over MLK weekend here locally in the mountains is due.
Bob, Tonya and the kids
11 Rockwood Roo 233S
08 Grady White Seafarer 228
08 Tundra 5.7 liter 4x4 crew cab TRD limited
08 Toyota limited 4 Runner Iforce V8 full time 4WD, tow package