Leftie, me old china plate.
Myself and my beloved have twice hired an RV, both for 2 weeks, from
http://www.cruiseamerica.com/.
First time was a round trip Vegas, Arizona Route 66, Grand Canyon south rim, Monument Valley, various national parks in Utah, Vegas.
Second time was San Fran, Yosemite, Vegas, Grand Canyon south rim, Sedona, Phoenix AZ, Joshue Tree nat park, LA, Big Sur, San Fran.
Definately worth the money for your own indepandance, plus the camp grounds at KampGrounds of America
http://www.koa.com/ are well run and a breeze to use - full hook ups etc.
We're seriously thinking of doing it all over again. If you want any further info, please ask.