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I have stayed at Lower Pines in a 39 footer and I would not recommend it for anyone unless you have a very large set of cajones. The sites are small and the road was carved out of the forest back in the 30s so it is narrow and hairy.
Try using the Search button in the menu above using the search term "Yosemite". Alternatively, browse our Destinations, RV Parks, Routes board. There have been numerous discussions on this subject. I think you'll find that the consensus is to camp outside the park, to the south.