I agree with Wick.
Everyone has a certain aspect of a product that they feel must meet their own expectations.
Some like great fit & finish on the interior. Others have specific frame structure they are looking for. geof like's insulation
Which by the way geof I see your point specially when I am working on the rig during the winter and it is freaken colder than heck and I have to use up all my propane to keep the place warm.