Jaynie,
Camping in the NE can tend to get expensive if you park in commercial RV places. They have a smaller window of time to get $, plus things including utilities, taxes, etc are very expensive.
We love the Burlington Vt area mostly due to the Shelburne museum, tho I wasn't overly wowed by the quilts they've got up right now, there is so much else there it is well worth a couple of days, entry fee is good for 2 days.
I know you will love it esp. if you can find a centralized location to drop the 5th wheel and cruise around in the truck. It may very well get chilly so pack warm jackets and rain gear...we were out in W Mass in the fall and it started to snow...we were at the Bridge of Flowers an old trolly bridge planted with flowers another cool place to check out if you're in W Mass at all.