I'm just guessing here, but because of the higher bed rail height of the newer trucks, I bet you'll end up with the higher one. But you really won't know for sure until you can level the trailer off the truck, measure the pin height, then see where this falls on your hitch. Probably allow for a 3-4" squat.
My bedrails are 57.25" at the hitch location, 58.5" at the rear, unloaded. My hitch height (Curt fixed hitch) is 17", and is all the way to the highest setting (just so I can see it over my tool box). Had to readjust the pin box lower to make it match. BUT, different camper, different truck, different hitch. I'm pulling just a tad high because of the high bedrails on the truck to get a good separation of 6" over the back of the bedrail.
Lots of variables. You can probably make either one work because you also have adjustment in your pin box height.
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