I think you will be ok at most parks. I have a 318 BHS now...before that I had a 38 foot fifth wheel Montana, never had a problem at any state park, but I was up in he 1000 islands mostly. The biggest sites supposedly were not long enough but when I would get there , found plenty of room. If your looking in the adirondacks I would check out old forge camping resort right in old forge...gorgeous up there...
2015 Dodge 2500 Big Horn 4x4 6.4 HEMI
2015 Grand Designs Reflections 323 BHS
Reese 16K Quick Slide with Factory Rail Kit Option