Hi Al:
Hummed and hawed about A/C. Did not want one on the roof as I had installed a Maxxair fan and did not have strong enough ceiling supports anyway.
Long story short, we were in Quebec last summer, in the
heat of summer. Couldn't take it any longer so I went to the local WMart and picked up a portable unit (single 5" hose). It stores in our front closet when we travel and vents out the side. I just pull it out and face it towards the rear. Cools the CT nicely even in 101F temps in Bethesda, MD later in the summer.
And yes, I knew we would eventually get a portable unit, so I put in a vent (a small opening door) in the trailer wall before we left. I've recently changed the "door" vent to a louvered vent so I don't have to remember to open the door when I want to plug in the A/C.

Where are you in YYC? We might be up your way this summer, after a trip to the Oregon coast and the desert SW.
Hope this helps!