I'm not familiar with that KOA but we're not too keen on KOA's anyhow. So many pack you in tight.
If you want a whole lot more room, more quiet, and don't mind being 10 or 15 miles from Myrtle Beach, consider Willow Tree RV Resort in Longs, SC. Really a nice park. We had something like 75' wide sites and the pullthroughs were so long we not only had our Montana and truck in there but could easily have put another Montana and truck in there.
This picture was taken through the screen of our front door. What you see is two sites. There is NOT a site between those two rigs. This is typical of that park.
Longs may be farther out than you want to be but if you don't need to be right in Myrtle Beach, this is a great park. Excellent spa, too. First class operation.