G'morning from Casa Grande, AZ. You'll really enjoy your visit up to Quebec. We're originally out of Duluth, Minnesota, and have visited Canada, and especially Quebec City a few times.
Although French is primarily spoken in Quebec, you'll likely NOT have trouble communicating. Toughest part is trying to figure out what to order off French menus when stopping in more rural, or small towns, since in the big city areas, they're used to communicating with visitors while those in smaller towns may not be. You'll still be o.k.
Now, with regard to visiting Quebec City, it'll likely be one of your most memorable destinations. Old Town Quebec is absolutely WONDERFUL. Clip clop carriages on cobbel stone streets, the wonderful promenade overlooking the St. Lawrence River in front of the magnificent and historical Frontenac Hotel. Sidewalk cafes, street artists, fabulous old ornate buildings with copper topped roofs, stunning churches, live, local music in the various little squares throught the town during the evenings, and...on and on. DON'T MISS IT!!
A good park to stay in is located in the NW corner of TransCanada Hwy. 20 (running E. and W.) and Provincial Freeway 73 (running N. and S.). This intersection is right S. of the Rt. 73 bridge over the St. Lawrence It's name is Berniere RV Park
(look it up in your campground catalogs).There are also others in this area to check out. Berniere is not particularly fancy, but clean, roomy (we easily fit w. our 40 rig and Honda Element tow car), and a great location for visiting Old Town. Just take your tow vehicle over the bridge and hang a right (Easterly) through residential area on into Old Town about 10 or so blocks. There are parking lots inside the walled Old Town city and they're worth it! Make sure to spend BOTH daylight afternoon time inside Old Town, AND...also, spend an after sunset evening wandering around. It's magical!!
We'd suggest another day trip to consider. Leave your rig in whatever campground you're at, and take your run around vehicle for a drive NE from Quebec City on Rt. 360/138 along the N. shore of the St. Lawrence River on up to a little town called Tadoussack. The drive is fabulous, the little towns along the way charming, and the spectacular views along the way are phenomenal. When you're almost to Tadoussac, ya drive onto a FREE ferry which takes ya across a beautiful fjord into Tadoussac. Once there, poke around, have lunch, and DO NOT MISS walking the boardwalk trail around the peninsula. Make sure you're camera is working, cause in addition to wonderful photo ops, you MIGHT see a whale or two rolling on the surface of the fjord or out in the river. It's a GREAT day trip and if ya leave Quebec City in the morning, you can comfortably be back by dark. It's a great trip!!
Hope this all helps a little. Enjoy!!
Steve & Lynette