The Comb Wash campground is just across the street and down the road a bit from the road heading to Hotel Rock...I'd think there's plenty of room on that side of things, even if there isn't on the road heading North.
Plenty of room in the camping area iLean mentioned, should be no problem even with a larger trailer ie 5th Wheels. It's a nice campground, some big cottonwoods and plenty of flat area. 95 is pretty quiet at night so road noise is minimal.