My family and I are seriously considering a road trip from Las Vegas to the Grand canyon, Yellowstone and to Yosemite next summer. We will have to end the trip back in Vegas, as we will be flying back to New York. In addition, we are considering renting an RV.. thinking it may be more economical... We are shooting for that "unforgettable family experience". Kids will be ages 10, 13, 15. We will have 14 days from start to finish. Any suggestions regarding routes, sites to see, campground, suggestions for traveling via RV, etc. are very much appreciated. Once we get to some of these destinations will be limited to what we can do and see because we will only have an RV, not a compact vehicle?