We were there twice last year and did fine getting DirecTV from both campsites we had. In both cases I put the dish on the top of the RV. (Motorhome) The first site was a little tricky and I had to find a 'hole' in the trees. Took awhile but I got it. But for a 10 day stay, the extra 15 minutes I fiddled around with the location was well worth it.
The second site was a snap. Turned out the satellite was pointed out directly the way the driver would face if sitting in the driver's seat. This gave us a clear view along the path of our campsite, over the road a little bit, and across the street to clear sky.
When you check in there may be a lot of leeway in what campsites are available. Or if not crowded, you may get to your assigned site, see one or two better suited, and get changed to one of them.
If you can get a good map of the campground, and look-up ahead at what azimuth the satellite would have to aim, you might be able to pick a site that has a great unobstructed view like we got (by accident) for our 2nd campsite example above.
Have a great trip.
P.S. We have two dishes, one that is attached to the RV roof and cranks up from the inside, and one that is portable and we can set-up anywhere within 50 feet of the RV. In the examples above, in the first case I had to use the portable. In the 2nd case, the crank-up worked fine.