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tranhv68@gmail.com | December 16, 2012
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I only really want the campgrounds with 240V 50A breakers to maximize my charge time.

I'd think you'd want 110V if you want to "maximize" the time you spend charging‼
;)

There are many campgrounds besides KOA. Many have 50 amp some only 30 amp. There are some public campgrounds that have no electrical service. Some also have cabins for rent.

Here is a web site that posts cutomers reviews of web sites, it shows what is available.

www.rvparkreviews.com/

So Mammouth Lakes is a little over 300 miles from Anaheim so if your Model S will have an 85 Kwh battery you could do the trip with just the one top up charge. Just remember it will use a lot more energy going up the mountain. I read somewhere to add 8 miles for each 1000 feet of elevation so make sure you have at least 70 miles in reserve. Coming back will be much easier, but you also need to be ble to plug in whilst there so your Model S can keep the battery warm.
The only possible relevant campground that I can find on the KOA website is the Lake Isabella \ Kern River campground.
http://koa.com/campgrounds/lake-isabella/
It advertises 30 Amp outlets.
Ring them and find out first.
Good luck.

Maybe you can pay someone in Lone Pine to install a 80A circuit and install an HPWC (it's not out is it?), but it will still take 2 hours to charge 145 miles, that's not so practical if I were you (I have taken the trip many many times).
hmm, for fast charging! without knowing where superchargers will be installed, maybe that's the next best thing. Need one in Mammoth too?

Flatbed to Mammoth, easy drive home downhill.