We've used a TRAVASAK for years in all sorts of RV's and we just love it. In case you don't know, they have zip-in (Velcro'd) sheets and one side of the bag is up for cool weather and the other side is up for warmer weather. They are basically a really neat sleeping bag with removeable sheets.
The larger sizes are nice cause you and yer sweety can be in the same sack.
Course, there are times, like after beer and chili, when that can be a bad thing for someone.
Bye,