ChrispyjCSLT22 wrote:
block foam insulation, roof insulation, have they not improved? especially on these new rigs?
Typically, the best insulation comes as part of an "Arctic" or "4 Season" package - usually an optional upgrade.
There's nothing exotic about it. It's just thicker-than-typical insulation, and double-pane windows* - the same sort of stuff that's been available on higher-end RVs for decades.
*The storage and tank compartments usually also have ducts from the furnace routed to them, although that doesn't do anything to help with summertime cooling.