Here's another congrats from a fellow Bigfoot owner. That trailer looks very good. We also sold a Casita
when we got our Bigfoot - took one whole day. I wish we could afford to have kept them both, though.
As Frederick stated, the 2500 series does have a higher cold weather rating. This generally includes thermopane windows
and all the plumbing and tanks being enclosed in the heated area. This only works with the forced air furnace
being run. A portable heater would only heat the living quarters but would not circulate to the tanks and water pipes. If you look at your black and gray tanks under the trailer you will see they are enclosed in fiberglass. The furnace
will send enough heat into this compartment to prevent freezing.
You will also find that the better windows
and insulation will help keep the trailer cooler while running the AC in summer. That is a real plus.
If you haven't already done so, check out the Bigfoot Owners Club website. The annual rally
is in Colorado this year and there are still some spaces left. Hope you can make it!