89 Chevrolet Fleetwood Flair 30' - right for us?

Not all RVs are created equal. Some have very little insulation in floors, ceiling and walls and some have it in their brochures with the R value listed. Newmar list the R values for their MHs and it is better than my condo. There is not a lot in a Flair because it was at the bottom of the Fleetwood totem pole then. TTs have the same problems. We got caught in 10F temp once with a '96 Pace Arrow MH. We used a tank of LP every other day.