I'm driving up to New Hampshire next week with a friend to climb Mt Adams. We're looking for a campsite from Friday to Sunday. I've been looking at campgrounds all around the area and nothing with reservations is available. What are the chances of finding an available first come first serve campsite if we get there on Friday? Any recommendations on what campground we'd have the most luck with? Thank you!

EDIT: I ended up getting to Dolly Copp Thursday evening and found an open first come first serve campsite. I didn't really look around though, so I'm not sure how many other spots were open.