The tongue weight has nothing to do with the frame rails on the coach. The tongue weight is determine by the manufacturing process of the hitch itself.
A few years ago the hitch used on the Forest River SunSeeker was upgraded from 5000/500 to 7500/750 because the hitch manufacturer changed the process they used welding the hitches.
It was the same hitch using the same metal but assembled with a different process for welding.
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Dave
US Army (Ret)
2020 Entegra Accolade 37TS
2019 Jeep Grand Cherokee Trailhawk (Toad)
FMCA - F432054
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