toyed with the Futon idea, but the boys rarely actually sleep in our trailer, I usually kick them out into a tent. But, with the low in Leadville around 25 tonight, we figured we'd let them share the propane warmth of Mr. Heater with us... My wife picked up a 3" gel memory foam mattress topper at Costco for less than $100 yesterday, so hopefully it will fit the bill.