F3fifty...there is no relationship between your truck's GVWR and the RV's GVWR. Key items for 5th wheel computations are pin weight and GCWR. The problem with the 250/2500 trucks (diesels) is they are within GCWR limits, but over pin weight (truck GVWR).
Actual tow capacity...GCWR minus the tow vehicle's actual weight when ready to tow.
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