Ohiopyle State Park Campground is okay but with your rig you may want to choose one of the private campgrounds in the area. Ohiopyle is basic with electric only and the sites aren't very big. If you do plan on camping there you will have to come in from the US40 side because the road from Ohiopyle to the campground is very steep and winding. Otherwise there would be a 16 mile road detour to take to get the one mile to the top of the mountain.
Go here:
Find campgrounds and type in Farmington, PA and a list of campgrounds will come up.
You may want to go biking on The Great Allegheny Passage:
Allegheny Passage