Some thoughts on the Contest and Cold Camping.
My experience with thermopane windows
in RVs is that the window seals fail, probably due to all the bouncing, and the windows cloud
up. A number of ours failed after 75,000 miles. As well usually not all windows
are thermopane. (I will say I've only had one rig with them and possibly this has been corrected.)
As to freezing temps, we have camped in ours for five days with no ill effects with coldest nightime temps in the teens F. It is not too difficult if you are at a full hookup site. We have never had the inside temperature drop below the mid to high 30's F, the temperature just before we wake up.
The only really vulnerable component on our rig is the gray tank because it's virtually outside. Keeping it and the black tank empty seems to resolve the issue, we just dump them before evening.
As well we put water in our fresh water tank and use it during the night. If it's below freezing we generally keep the outside water hose off. This saves the hose and keeps the internal water pipes unpressurized, providing expansion margin should they freeze. (In one long term cold weather situation we did put electrical
tape and insulation on our hose to keep hooked up and the hose from freezing.)
The hot water tank is relatively safe because it's always hot in our rig since we always electrify our hot water tanks.
For sleeping we use an electric blanket. Occasionally if the temp seems to be dropping rapidly in the trailer I will turn on the electric heater as morning approaches.
We have not camped at temperatures below the teens F.
In the morning, simply making breakfast rapidly warms the trailer.