5th wheel or bumber pull? The following assumes a 5th wheel. But the same is true for bumber pulls. I would go with a little less hitch weight than pin weight.
First I would check the pin weight. A tail heavy trailer will do what you describe. If your truck can handle it go for 25% pin weight. Also check if the traileris towinglevel. A nose high trailer will also do what you describe. A bumber pull usually does best with a little nose low.
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