Wells Grey PP was beautiful. The KOA there is very nice. Be aware that the areas between Jasper and Wells Grey in northern BC are pretty remote so sometimes groceries are kind of limited. Hwy 5 the Coquahalla (spelling?) was a beautiful drive. Penticton and Kelowna were beautiful. There is a rail trail (Kettle Valley Trail) that goes over amazing trestles that were built in the 1800's with amazing views of the Lake. We stayed at Bear Creek Provincial Park in Kelowna and liked it. Although most Provincial Parks are dry camping. Have stayed in BC a few times over July 1 and haven't really had problems finding spots.
From there if you skip Vancouver and the west side of BC it is an amazing drive over the North Cascades Hwy 20 in Washington. Roslyn is a great town. Whidbey Island has Deception Pass State Park, or Fort Ebbey which is a WWII gun emplacement. Great sea kayaking there. Fort Flagler or Fort Worden on the peninsula near Olympic NP are also good. Lastly, not sure if you are going out the coast but Quileute Beach Resort has great RV spots right on the ocean. In the spring you can see whales from your trailer. Cape Disappointment is also another great spot which is just over the bridge from Astoria.
We loved Asheville when we visited. I think you will really like Western US/Canada - similar vibe.
