Don't know if you have arrived at Yosemite Lakes RV, but I would certainly avoid 49 between Mariposa and Coulterville.
IIRC the best bet would be to take 99 north to 132 to 49 to 120.
There is a shortcut exiting 99 at Turlock and taking Geer Road north to 132, but I'm not sure how much time you would save in the coach.
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Tom, Patty, Hannah "The Big Dog" and Abby Kat, Indianapolis, Indiana 2000 36' FDS 72232 Our Photos
We live out in our old van. Travel all across this land. Drive until the city lights dissolve into a country sky, me and you - hand in hand.