Depends on where you'd be camping. On the BC and Wa. coast, we don't need our AC. But that is with some shade trees. If in the current heat wave with no trees, we'd use our AC. One year, we never used it, another year, just once.
Goggle says daytime temps. in the Cariboo are typically around 19-22C. That's cooler than where we are, just inland of Vancouver. If just camping around there, you'd probably be fine. Is see on Sunday it's forecast to go up to 28C (82F). That's starting to get uncomfortably warm but again, depends if you would be in shade or not. Travel to the interior of BC and you'd probably expire without AC...
Depends on tolerance level. Camped with friends of ours in June (before it got warmer out). They had theirs running non-stop, we didn't use ours at all.
If you don't have a good power vent like Fantastic Fan, I'd say no. The little "ordinary" ones don't move a lot of air (compared to a Fantastic Fan) and are very noisy.
The way the weather seems to get warmer longer each year, I'd say no. We've been having a real heat wave and dry spell on the coast this year, worst ever. (We have a small tree farm and the trees are suffering like never before.)
Another point would be on resale. If you ever want to sell it down the road, could be harder to sell.