We are planning a trip for middle-late May 2013. We hope to take in Yosemite, Sequoia and Yellowstone. Anyway, we aren't sure if we will be renting an RV for Yosemite and Sequoia/Kings Canyon parks..do you recommend this? Are these vehicles too large to navigate these roads or will our driving on scenic byways be limited by driving an RV? Are there decent campsites available for RV?