I have a 16' Duramax short box, and after touching the underside of our brand new(!) trailer with the box of the truck reversing into my driveway the very first time, had to move the hitch from the middle set of holes to the top set.
The rear-end of the trailer sits a little lower, but I don't seem to notice any negative impact(s) towing at 110-120kmh on our freeways (~65-75mph).
From what I hear, the aim is to have a full 6-8" of clearance between trailer and sides/rear of box, while sat on level ground. Any less, raise the hitch and/or lower the pinbox (Like I say - hearsay. I'm happy/prepared to be corrected on this though)
Trailer is a 17' Eagle HT 29.5BHDS with the 'standard' pinbox. Truck has B&W Companion (no slide option - I'm cheap, and will watch cab corners closely when manoeuvring!)
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