Sorry to burst your bubble, but Iowans aren’t allowed to hike the PCT. You need to stay at home, tend the cattle, start researching seed corn varities for next years crop.
Just kidding. (I’m originally from Tipton.)
Campo is pretty easy to get to from San Diego via local bus service. The benefit of taking public transportation down there (beyond environmental reasoning) is not having to worry about finding a place to leave your car, and not having to worry about it while you should be enjoying your hike. A simple option logistically would be, as you mentioned, a short yo-yo hike, where you go north for about a week then turn back and return to Campo or another point intersecting the regional bus line. However, I can definitely understand your desire to cover new ground through the duration of your trip.
If you choose to drive yourself, you might try posting on pct-l. There are many friends of the PCT in the San Diego area, and someone may volunteer to let you leave your vehicle at their home while you hike. You’d just have to figure out a way to get back to it when finished, and someone in the San Diego area would be better able to offer suggestions there as well.
Another thing you might try is contacting Chris at Silver Pines Lodge in Idyllwild. (Search Silver Pines Lodge for a website.) I’m not sure of your intended pace, but this is a little under 200 trail miles from Campo. She is a wonderful woman, very accomodating and hiker friendly. My hiking partners and I had a great experience staying with her in 2007. If you planned on patronizing her lodge she might be willing to let you park there for a couple of weeks. (Of course I can’t speak for her, but worth asking.) You could drive down there, park, and find your way to Campo, then hike back to your car.
I would urge you to be aware and prepared for extreme weather conditions this time of year. Don’t let the word “desert” fool you. Those mountain ranges can get some pretty nasty storms in the winter, especially around Mt. San Jacinto (near Idyllwild.)
Just a couple of ideas. I hope it all works out for you and you have a great hike. It’s always good to hear of fellow Iowans getting out to hit the trail. Feel free to email me if you have any other questions I might be able to help with… and GO HAWKS!
Gesh