In Indiana, at State Parks, as long as you are on the site, they don't care which way you face. We see this all the time, where 2 campsites are together and one turns completely the opposite direction so camper doors and awnings face each other.
With a CLASS C you should have no problems pulling in forward. With a towed trailer, you need to make sure there is room to pull forward with your tow vehicle and still unhitch and still get the tow vehicle back on the road, unless the pad is long enough and you don't care if the tow vehicle is pinned in.
I've never seen anywhere in Indiana State Parks where anyone got into trouble doing this. And folks do it quite a lot here too.
I've also seen my share of CLASS A's facing forward in the camp sites. When I asked someone once why they faced that direction, they said so they wouldn't have to look at the road out the front windshield. Instead, look at the tree line, lake, river, or other campsites to the rear of the campsite pad. I've also seen my share of this in private run campgrounds to in Indiana.