We are planning a two & a half week trip in June, flying from England to San Francisco where we will hire a 28-30ft RV. (There are only two of us but we like the extra space.) We have already toured New Zealand and The Rockies so are used to covering long distances. Can anyone recommend a route which takes in Yosemite, Monument Valley, Grand Canyon and possibly Las Vegas. Are these distances too long? Should we consider a one-way trip? We like to book RV Parks ahead so can anyone recommend any good ones en route? Is it OK to take an RV to the South Rim i.e. are roads OK? and how easy is it to get a pitch once there? The other alternative would be to get a helicopter flight. Is early June better than late? Are there any other "musts" that we should visit? We'd be grateful for any help.