You can take state rd 120 out of Manteca and go into the north entrance of Yosemite. It looks very curvy. But 120 is what goes to Tuolumne Meadows. We weren't really campers when we lived in CA, except at some horse shows. We did tent camp at Tuolumne a LONG time ago and there were bears everywhere at night. We were new to CA then and we thought they were raccoons LOL!
I used to go to a horse seminar in Fiddletown (SE of Sacramento) and it was so beautiful in May. I see there is an RV campground nearby in Plymouth
(Far Horizons 49er Village RV Resort).
We are taking our EggCamper
to Sacramento in June and then on to Corvallis, OR, a long way from Maryland