You might look at the length of the drop on the ball on the hitch as factor. I would say that anything over 2" would seriously degrade the pull rating of the hitch but not the tongue weight. The combination of a long drop, a heavy vehicle with power steering and sharp turns puts a tremulous force on the welds. Fillet welds are not particularly strong to a twisting force.
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Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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