When we bought our 5th wheel 6 months ago and I was worried about this. We have a 2020 DRV 41 RKSB4. It has 2" risers installed on the 5th wheel. Our truck is a 2020 F450 and we use a B&W Companion Hitch (Ford puck system). So far we have not had a problem. The rear of the pinbox does come very close to the top of the bed rail on very tight turns. When I say tight turns I mean outside of normal driving. I can get my truck to almost 90 deg before it gets to close for comfort.
I saw the video you were talking about and he had a bed cover on his bed that added to the problem.
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