I can't think of a trailer (other than owner modified) that doesn't have some sort of insulation.. even if only dead airspace in a double-hull. But I have been in plenty of Bigfoot trailers that DON'T have double-pane windows.
Watch out for the Internet!!
I did make an assumption that Bigfoots had insulated cabins. I do know, for sure, that just because the Bigfoot
Cabin is insulated (including double insulated windows), it does not follow that the pipes underneath the trailer are insulated (encased in fiberglass). To say that the Bigfoot
has the winter package, the cabin, windows
and the pipes need to be insulated.
I will say, that every Bigfoot owner I have communicated with has double paned windows in the cabin. Maybe we need to isolate the model year. I have researched the '88 - '95 Bigfoot 17 model years.
I certainly don't want to pass on bad info.
But ... I did want to caution .... "Buyer beware" ... You need to know what you are looking at.