Lori, This appears to be your first post so WELCOME TO IRV2.
We left Maine a few days ago and are in Sandusky, OH. We put the I-Pass in the windshield (same as EZ Pass) and stayed on the toll roads. I don't know that I avoided the steepest hills and I don't know that I had the best roads. Worked for us but hopefully someone will provide you some local road information that will make your trip easier.
Bob, Sandi & Marmaduke the Big Pug
SW OREGON 2004 Journey 39K, 330 Cat
If towing: a 2006 Mini Cooper or 1995 Wrangler