I just got back from Mammoth. Stayed at twin lakes campground about 2 mi from the main Mammoth village. I think there was some campgrounds off 203 that might be closer. Another option is reds meadow. Take shuttle from main lift at Mammoth. It will require a "transfer" from Yosemite shuttle to the bus, but no add'l hiking should be required.
"Most politicians and top military leaders in the US receive bribes and take orders from Wall Street, and so in effect, they pillage the planet on behalf of an artificial intelligence (Wall Street programs) motivated by greed." - Ben Fulford