Rv Parks In Montreal And Quebec City Options

[fuzzidee]

My wife and I are considering renting an RV near our home in southern NY State and driving to Southern Canada in August; we'll be traveling with our 9 year old son. We're hoping to spend a day or two in each of Montreal and Quebec City. This will be our first trip in an RV. I am wondering if anyone can give me advice about a couple of things:
1. Where to stay in, or very near, Montreal and Quebec City.
2. Since the only vehicle we'll have is the 25-foot RV, how should we get from the RV Park to the center of each city? Is this practical? Expensive?
Of course, since we are completely new to this experience, any other advice would be extremely welcome!
Thank you!