Hi my name is Louis. I am planning to rent a 23'-26' RV do a national park round trip from Las Vegas through Utah, New Mexico and Arizona. My wife an I are in our early 70's. She is a bit hesitant about this trip in an RV. We are planning 2-3 weeks. Is 3 weeks too much? Am I looking at the right size RV? I am hoping she will like it as we live in South Florida and I would like to go to cooler climates in the north and west during the summer months. Any thoughts on this to help make it more enjoyable for her?