First of all, thanks for your prompt answers... The idea to use an RV is to avoid pack and unpack several times and as we are traveling with our one year old baby we like the "apartment style" of an RV instead of motel, because we can cook his food, travel at afternoon when he's more quiet, and we love the "tent" life also... We dismiss the complete loop as we get flight tickets for almost same price getting in on San Francisco and departing from San Diego... Regarding RV costs, the company charge just extra 200 for one way trip, the average park cost is between 40 and 70 by day in this season and RV rent is 140 a day (Plus usd 3 by hour for generator use...) a Holiday Inn charge 250 to 300 for the 5 so is almost the same...

Anyway as your suggestions we are evaluating to rent a Ford Explorer or similar and search for motels in order to get a real comparison... at this moment we are trying to make the itinerary (by reading a lot of posts in your excellent forum....)

Thanks again for your comments!