The simplest method is shown below- take the camper's estimated actual loaded weight and plan for a fixed percentage of that being tongue weight.
A lot of times, during the research and evaluation process of fifth wheels is trying to figure out if your truck can or cannot tow the camper of your dreams. Most trucks run out of payload long before hitting any of their other ratings. This payload has to carry everything in/on the truck and most importantly, it has to carry the weight of the tongue or pin pushing down on the rear of the vehicle. Use this calculator to figure out the weight of the pin/tongue weight of prospective units. Once you own your camper, the form below should become worthless. You should get scaled and get accurate weights (click for instructions on how to weigh a fifth wheel or travel trailer).
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Your truck should have this much "Cargo Carrying Capacity" in order to stay within all of your ratings. If you go to a scale and get weighed, this "Cargo Carrying Capacity" is the difference between your truck's gross vehicle weight rating (GVWR) and it's actual weight. If you're doing this before buying, make sure you estimate the things that you normally would carry for a camping trip (don't forget the hitch!).