I see you mentioned north central but In south/central VT is Winhall Brook COE
small country towns, rivers, ponds for fishing including a river that cuts through the campground that you can go swimming in. Boarders the Green Mountain National Forest.
South side of the campground has about 22+ W/E sites but you have to cross a narrow bridge. (you should be okay with you 35'DP)
In the Northeast Kingdom check out Barrewood campground
well maintained small country campground, fishing in the area