I've never stayed, but from my "Big Rigs Best Bets" book (which hasn't disappointed me yet), here's a stay that sounds pretty close to highways in the Columbia, SC area:
BARNYARD RV PARK (LEXINGTON): Paved streets will lead you to an open grassy site. The double up spaces in the A row - #2 thru 6 exceed 100 feet while #1 is 90 feet. Sites B3 thru B7 and C2 thru C6 are a tad over 60 feet. FF: A3 thru A6. Wi-Fi.
Directions: On I-20, Exit #58 and head east on US1 North just over two miles to the park on the left (behind flea market). On I-26, Exit 111A and head west on US1 South three miles to the park on the right.
Email:
barnyardrvpark@sc.rr.com
Web:
Barnyard Flea Markets|Rental Selling spaces in Flea Markets of South Carolina,Outdoor Flea Markets in North Carolina and Flea Markets in Georgia for Antiques,Merchandise and Crafts
Address: 241 Oak Drive, 29073
Phone: 803-957-1238 Reservations 800-633-6351