One other issue is that the RV manufacturer generally modifies the frame. This can throw the geometry off so that the coach might originally have a certain CGWR but the changes the manufacturer made to the chassis might reduce the towing capacity.
I am thinking about things like excessively long overhang, not putting in enough support to support frame extension for heavy tow loads, and so on.
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The only thing that works on a RV is the owner...
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