There are 3 tunnels toward the NC end that are low on the edge of the road but are about 18 feet in the center. On those you need to ride the center line to get through. All others will not be a problem. My camper is also just under 12 feet.
2015 XLR 29HFS Toy Hauler
2016 Ford F250 Lariat Crew Cab FX4 Power Stroke
2007 Harley Softail Deluxe
2005 Victory Vegas