We over wintered in SW Virginia near Wytheville and use electric heaters exclusively. We could not run two of them on a 30 amp circuit. So either the living room or bed room got heated. We also had an electric blanket, all windows were covered in plastic to slow down drafts all doors were hung with large beach towels to stop the drafts, we had no slides, We had a heated hose for the water, which would still freeze at the hydrant and only thaw out after the sun came up.
Temp never went below 19 degrees. Lost power 3 times to snow breaking power lines in the mountains.
The above conditions would be balmy compared to Calgary.
You seem to be convinced to do what you want, so go for it and don't bother to ask for advice. The other posters have been trying to tell you that this is a bad idea. You are determined not to listen so, go for it and do let us know next May how it all went.
If you are doing this to save money, buy a tent. I have seen natives in tents in Alaska, they survive, of course you don't hear about the ones who don't.
Watch the videos of the people in RVs in N Dakota working on the oil fields. You will be able to make one your self.