Congrats on the new truck. My neighbor has a 14 gmc dually with a 38 foot Jayco designer with two ac units. We both pass thru a local state road 13.8 overpass in Norlina with our fifth wheels with no problem. Not sure his box is the same as the 15 and he is 4wd. He has sufficient rail height but sits about an inch high in the front.
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Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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