Driving a 27ft Class C in Mount Rainier NP

Hi and Welcome! You might not want to hear my opinion, but here goes. I remember a sales rep telling me once that driving a 27 foot Class C RV was just like driving a car. It's not. RVs are longer, wider, taller, and heavier than most cars and vans. You need to be concerned with rear-end swing anytime you are in close quarters, like gassing up and in some parking lots/campgrounds. With your driving experience in vans, I think you would be OK starting out on Interstate highways or highways that are two lane, but well maintained. My recommendation is that you spend a few days driving the rental on highways and parking it in campgrounds to get the "feel" of the unit. Once you are fairly comfortable driving the RV around on "normal" roads, then you can advance to the more challenging mountain switchback/steep hill type roads. BTW, our family of four likes our 27 foot RV. Anything smaller could be a tight fit for your family and would likely have less storage space. Best wishes for a successful RV vacation next year.

Bob