Here's a good site for CA395 camping:
http://www.scenic395.com/camping-guide/If possible, stop at June Lake area - very pretty and the mountaintops will have snow - hopefully, not below where the campgrounds are.
Lone Pine has nice public campgrounds and also a RV park. Good place to tour the old western movie sets.
Stay in Lee Vining and tour the Bodie Ghost Town.
We loved driving 395 with our 40' MH - no issues.