My setup is a 2021 GMC 2500 4X4, 6' 9" standard box, an Access tonneau cover, and a 2021 Jayco 310RLTS. After a lot of research, I went with a B&W Companion hitch and replaced the MORryde kingpin (standard on the Jayco) with a Reese Sidewinder. There is a little better than 6" clearance between the top of the tonneau rails and the bottom of the fifth wheel. I might not have needed the Sidewinder but with all of the things you have to be aware of while pulling and backing a fifth wheel, the additional clearance provided by the Sidewinder is comforting.
Good luck with your research and decision.
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