I did a lot of state park searching and research before we ordered our new Puma Unleashed 351THSS. At 37 feet, it's a good bit of trailer and some of the parks do have small sites here in PA. What I found was that some can only accommodate up to a 30' trailer, while most at least have a few sites that can fit the bigger trailers. Either way, whichever trailer we decided on wasn't going to fit on a 30' pad, as we wanted 2 bedrooms.
Granted the sites that will fit the trailer may not be the top choice sites, but sacrifices had to be made somewhere. The hardest part I've had with the state parks is the NARROW, one way roads through the campgrounds. Some have well designed spurs that come off at an angle and its no big deal. Others have pads that are 90 degrees to the road, and there's just nowhere for the nose of the truck to swing, and it takes a bit of space to swing the CCLB around.
2013 F350 dually
2015 Palomino Puma 351THSS Premier Edition
2015 Nights camped 15
2016 Nights camped 5