Claytor Lake St Park ok for big Class A's?

While there are a number of sites that you will fit into - there are also a number of sites you won't fit. It looks like you can reserve by site now - I would focus on sites 1 to 6 and 35 to 40. These are back in sites that you could overhang the rear of the site if necessary. Sites 8 thru 12 might also be an option - I can't recall if really large rigs were in these sites when I was there. I wouldn't even try for the other sites (21 through 34) as I believe they would be very limiting and you probably would not fit into them with a rig your size.