I'll be doing a ride through PA in mid-May and will more than likely use some of the PA state bike routes but I'm not totally trusting of them. It's been years since I've ridden cross PA but I remember lots of hills and trucks- I don't mind the hills but trucks on narrow roads with steep hills can be a little daunting- so if there are preferred routes it would be a help.
My "tour" will take about 6 days and I'll report back on the roads I chose, which sounds like it will be well before your departure so hopefully it will help you plan your route.