Stayed here for more than a week in early January and enjoyed it.  There's a bunch of nice state parks in upstate SC - this one is about 10 minutes from both Table Rock and Devil's Fork.  Nearest town with major stores is Pickens, SC.  Greenville is about 45 minutes.

*Navigation*
The state park website mentions that rigs over 40ft will have trouble.  I think 40ft is conservative, but 50ft+ could definitely be problematic.  My truck plus trailer is 43ft and it was tight but manageable.  The problem area for larger rigs will likely be the curves before and after the dump station/restrooms (sharp turns plus elevation drop).  It will be difficult to fit in dump station area with a larger rig as well.

*Internet*

Verizon 5G was blazing fast here on my Pepwave - literally over 100mbps download. Starlink was able to connect, but obviously wasn't very useable due to trees.  

*Site*

I stayed in #3 which was definitely one of the better sites there.  Easy back in with very private views looking out towards Lake Keowee & Jocassee.  In summertime you probably won't be able to see much with the foliage.  Used levelling blocks, but it wasn't bad.

*Facilities*
Restrooms were older but clean.  Showers had hot water.  As mentioned, dump station is right in front of bathrooms.  No laundry.