On Jamaica State Park's website I was looking at sites 25,27 or 28. They seem nice and shady. But they don't really say anything about being level. Kind of hard to tell from the picture. Your right, from the pics of Winhall Brook it appears they have very nice grass.
Looking at maybe a mid July trip of about 15-16 days. I know I'll have to spend at least 5 days at Lake Dunmore's Kamperville
North of Rutland. Kind of a busy private park, but my wife has a ball playing bingo there. I really like kayaking
on the lake (Lake Dunmore) there.
I like to do two VT. State Parks with a private place in between to charge the batteries back up and do laundry.
Here are a few pics from our last VT. trip