Congrats on the 3001w, we love ours; bought it new in April 2014 and have about 12,000 miles and about 175 nights total so far in it. We haven't camped in Alberta (yet), but we have camped when the temps were in the low 20's for several days with no real issues. You didn't say, but I am going to ass/u/me that you will be parked with full hookups? Turn on the holding tank heaters of course, buy an heated water supply hose
(available from many places) so your city water line will not freeze up, and make sure propane is available nearby! We were burning through both 30# tanks in about 3-1/2 days.
What we should have done is take a couple of space heaters with us, one for the living area and one for the bedroom and we could probably have gone for a week before refilling.
Also, as the WJ has single-pane glass (like 99% of all RVs) you get a lot of condensation and moisture on the inside of the windows. We found that if you leave the bedroom A/C unit on (fan only) with the main cabin HVAC unit on heat it keeps the windows clear of moisture. Kind of noisy, but really helped eliminate the excess humidity. You might get the same results with a couple of medium sized oscillating fans running 24/7.
Either way, I am jealous of your trip, you have to post photos when you get back!
D_B Travelers - 30 nights in 2016... so far. 54 nights in 2015. 2014 Rockwood Windjammer 3001W Diamond Pkg, 2015 GMC 3500HD CC DRW Duramax, Equalizer 14K hitch, TST 507rv TPMS.
"Happiness? A good meal, a good cigar and a good woman - or a bad woman; it depends on how much happiness you can handle."
George Burns (1896 – 1996)