Wow! Your up early. I thought I was the only one.
Pin weight is the weight on the trailers pin(hitch point). Generally speaking a well designed fifth wheel will have between 18 and 22% of its total weight as pin weight. You will get lots of arguments on this subject, but lacking any factual weight numbers, use 20% of the fivers GVWR number as your pin weight. Depending on brand and size of fiver you pick a dually may not really be necessary. But it sure makes for a better towing vehicle for fivers over about 12,500 GVWR.
