Carmen and Joey
As Traveylin Pops said, the 17 days you have is way too short. You'd be a lot better off to fly to Alaska, rent a MH and spend the time in Alaska. Most people will tell you that even that is way to short to see Alaska. Either that or rent the MH as planned but only go up as far as one of the northern Canadian towns, fly back from there and do the Alaskan portion later. Again, the 17 days is way to short to see what Canada has to offer.
I'm not sure how many miles you're planning on driving a day, but one of the main things every says after they get back, is to slow down for the road conditions. You're not going to be on a freeway at 70MPH. If you do break something from speeding for the road conditions, most of the RV repair places in northern Canada have at least a two week back log of work before they can even look at you. And when they do, if parts are needed, it will be another week to get them.
The Lynden trucks can make the trip in 72 hours when they need to, but considering the time you'll spend setting up everyday, you're not going to see much more than they do. You really need to reconsider how far you want to go in that short of a time.
Bill