My two cousins and I spent a January weekend in my hybid. I slept on the front dinette, and they shared the rear tent bed. Kept the front bed closed. No PUGS, no reflex, just threw an old bed sheet up over the tent end as an extra layer. Also put a big sheet of couragated cardboard under the mattress as an extra cold blocker. Regular sheets and one blanket. Outside temps ran 20* to 27* inside stayed right where set at 65* with the blower running approximately 1/3 of the nite.
Picture taken before setting up camp