We camped in Tuolumne Meadows in September in our 31' Airstream. There were plenty of spots that would hold us.
We were in Spot B40 the A spots were all bigger and held some big rigs.
C loop were small spots.
In September it was very hot and dusty. We were close to the bathrooms and the water faucet. I amused myself by watching all the campers wash their feet or their dirty dishes at the hydrant...despite what the sign attached said. LOL.
Desert View Campground on the east side of the grand canyon, only had maybe three or four spots that we could fit in.