Frank,
No problem. I live on the east coast and will not be back until next July. Actually, my wife and I had experience flagging one down this year. He had just left the Dog Lake parking lot heading west when we ran out from the trail and waved at him to stop. He immediately stopped for us but this was a quiet area on a side road instead of Tioga Road.
One of the trips I plan to take next year is Waterwheel Falls. Initially I was going to start at the stables towards Glen Aulin. To make it more interesting and avoid covering the same ground twice I've decided to just park there and take the shuttle to the Murphy Creek trail and approach Glen Aulin that way, perhaps spending my first night near McGee Lake. Getting dropped off at the trailhead would save me a half mile walk along the highway.
Jim