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What's the electrical setup look like on the camper? Standard TT30 (120V, 30A) connector? Does the camper have it's own cord that already has a TT30 plug end on it? If so, then you need a L14-30P to TT30 dogbone adapter. I prefer the dogbone adapters because they provide some strain relief to the plug on the truck instead of a rigid adapter.
If you have a TT30 plug, then the adapter you need looks like this:
