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These things are always tough to figure out. Do you have actual weights of air stream, boat, and boat lift or manufacturer specs? Where are payload numbers you are using coming from? Most 2500 diesels are around 3000 lbs of payload.

A lot of times people use payload numbers from website and trailer specs from manufacturer. Payloads are less and trailer weight are generally higher when you put all your stuff in and then the truck is over capacity.

F60 heavy front suspension/ camper increases your FGAWR by 400 lbs and has a larger front spring rate. It helps for more load capacity on front axle and more roll stability and understeer with load. Most times the limiting factor for pickup campers is over FGAWR not gvw or RGAWR.
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