Tim,
I don’t know when they started using offsite parking and shuttles, but I’m surprised they did NOT use them as recently as ‘88-89. I definitely had to park offsite at Pebble in ‘82. Heck, I went to the Women’s Open in 1985 at Baltusrol and we had to park along an unopened stretch of newly-built freeway and ride school buses. And that for far fewer spectators.