The Oliver is truly the Lamborghini of fiberglass trailers. I hope their claim about 4 seasons is correct - especially with regard to condensation.
We had a 19 ft Escape and were caught in a blizzard in Utah. We paid extra for dual pane windows
and the insulation package, plus extra for the under-coach foam spray and tank heating pads.
In spite of these extras (about $2,000 or so added expense), the coach struggled to keep warm. Even with a dehumidifier blasting, there were BUCKETS of water pouring down the interior walls in condensation. We got through it ok, but it was not pleasant.
The Oliver would be our first choice if we wanted another replacement. We are looking seriously at getting one soon.