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Forget any published numbers. They only apply to EMPTY campers. There should be a label in or on the camper giving you lots of required information, like GVWR - Gross Vehicle Weight Rating, max CCC - Cargo Carrying Capacity, axle ratings, manufacture date and location, etc.
Your tongue weight (TW) is impacted on how the camper is loaded. Stuff in the very front will increase TW. Stuff in the back will reduce TW. Stuff loaded above the axle will have very little effect.
The TW must be at least 10% of the actual weight of the loaded camper, or towing will be horrid. The best estimate of TW is to use 10% of the camper GVWR. If the camper is a bit lighter, it becomes a safety margin.
There are resources to show how to weigh the tongue at home, if you want those.
What is your intended tow vehicle?
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