We have a 2011 Cameo 31KSLS - it is 32ft. It has dual pane windows. We have been full time in it since Oct 2011. It is an excellent trailer and we have only had a few minor problems that DH fixed on his own. We spend the winters in Arizona and summers (April - Oct) in Alberta, BC and Sask.
The coldest weather we have had was in Oct 2012 - we were in southern Alberta and it got to -25C for about a week before we could head south. We ran 2 electric heaters & the furnace. The water lines were fine & we were comfortable but we did use 30lbs of propane every 3 days. We now stay in the Vernon area in April and October as it is much warmer than southern Alberta.
We boon dock and can spend 10 - 14 days on a tank of water.