We used to tow with an older GMC Dually, was a 13K fifth wheel. About 2400lb pin. No issues except over heating and lack of umph on hills. Slowed down to 30 mph on not so steep grades... It had a 454 no diesel. 410 gear. The same tranny, but is was always maintained well. A must on those.
Your Gross capacity on the truck will be over with the pin as Joe mentioned.
Short local trips might be fine, long hauls might need more thought.
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