Talked with the chamber of commerce for both Huntersville $ Lake Norman.
There are NO RV parks in the immediate area. Statesville is a BAD choice as the I75 Traffic can back up at any time.
Found two places on goggle which seemed to have decent review's.
Elmore RV Park (18 -23 min.)
Address: 4826 N Tryon St,
Charlotte, NC 28213
Phone: (704) 597-1323
Apollo RV Park (15 - 18 Min.)
Address: 4275 Morehead Rd,
Concord, NC 28027
Phone: (704) 455-2409
Hope this helps.