Originally Posted by Big bird
I think the industry lives behind confusion over substance.
I've been able to figure out a few things from the brochures. Most of the cheaper units are r value 7-7-7. As they get somewhat better, they are r-7-12-14. Oddly, though, not all of the brochures include this information at all. Enclosed underbellies are sometimes in the pecking-order of quality. Better windows are described, but it's impossible to figure out if they add much value.
Some units are Azdel and/or pressure bonded, but it's hard to figure out from the descriptions if it adds substantial insulation quality, or if it's mostly structural.
Some brochures give the foam thickness, from which you can somewhat extrapolate better insulation, however, I noticed in some forum posts that there are voids on the joints, allowing air to whistle thru the unit.
Why do I care about this? If I only camped where weather was perfect, It wouldn't, but fuels cost A LOT these days, and we're in situations where it's work and inconvenience to obtain the fuel.
When you're driving down the road in a car, heating and cooling the interior costs practically nothing, so we do not care for this purpose, the energy use question.
This may be an owner forum, but I'm constantly shocked at the level of knowledge here.