Sorry Jon, I've been offline and missed your inquiry. Both times we "camped" up in Yosemite actually was with our 17' Casita and then it was once on the West entrance and the other time near the South entrance. I remember seeing longer tt's up there when we did go up for the day. I see that you are considering a Spring trip... if you decide to do Summer, those sites tend to fill up as soon as they open up for reservations. Both times we traveled through, it was within a few months of going that we planned it so all sites were already booked for the summer (one of the reasons we stayed outside the park). One thing to keep in mind if you don't have a generator, there are no electric sites (at least not the last time we went) so plan cooking accordingly and have your batteries charged. If you have a pet in the summer, you may need to be aware of day time temps in the tt if you take off to walk any of the trails. Hope this helps a little
What part of the central Cali are you from?