Call the winery ahead and ask if you can park in their lot - both times they have been more than happy to let us. It's a long drive from Colorado to New Hampshire and this is right off of I90 about 1/4 of a mile, with grocery and gas just down the road.
No amenities but if you get in when they are open, dinner and good wine and smiling faces. And can't beat free.
Pulled our teardrop right into the lot and made camp for the night. The only reason I'm giving it 4 stars is because it's not actual camping - but it's great for what it is and they are super kind and generous.