Going through tunnels, hug the yellow line to maximize clearance. Remember are heights are measured at the white line. The shorter tunnels are all arched so two feet over there is another two feet of clearance.
Also be curtious and let the traffic around you at the overlooks.
2015 Ram 3500 4x4 Crew Cab SRW 6.4 Hemi LB 3.73 (12.4 hand calc avg mpg after 92,000 miles with camper)
2004 Lance 815 (prev: 2004 FW 35'; 1994 TT 30'; Tents)