Some thoughts
Just replaced my tow vehicle with a new to me 2013 Duramax RWD 3500, I had a 2006 Dodge Ram with the 5.9 Cummins, Well, the dodge bedrail sat at 55 inches tall the Duramax sits at 57 inches so what do...
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I don't personally think 5" is enough rail clearance and I doubt you'll have even that if your new truck is 2" higher. There are a variety of ways you could go about lifting the trailer up a bit so it rides level with adequate clearance.
