Well you'll be happy to know that if you do have the enclosed underbelly then you DO have the thermal package
that's the only way to get the enclosed underbelly on the 19rd's. They put extra foil insulation in the roof with that package (and slides too, but we don't have any slides) and that raises the R values a bit.
I still need to order mine, but that is going to happen VERY soon as we just closed a deal in selling our house and once we figure out our closing date (and our subsequent moving date) I'll know better when we can get to pick up our sweet little trailer.
We also are upgrading from a pop-up, and yes, those 19rd are going to be BLISSFULLY WONDERFUL compared to what we were used to
I think we love those living quarters windows because of that view effect we were used to in our pop-ups, I just can't fathom getting a camper without having lots of windows for those views.
I'm envious of you getting to camp already, up here in Wisconsin we still have a good 2 feet of snow in our yard in places.