Re: 20' max capacity
The max load capacity rating for a vessel does not include full fuel load, that's merely part of the vessel's max gross displacement. It does include propulsion machinery only when that propulsion is externally mounted, i.e., an outboard motor. Max capacity does not include inboard or stern-drive weight in vessels so equipped.
The max persons rating is based upon 140 lbs average per person. That's the average weight of all persons: including men, women, and children in the average. Obviously, if those persons are adult men, you need to re-figure.
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Common Sense is learning from your mistakes. Wisdom is learning from the other guy's mistakes.
Fr. Frank says:
Jesus liked fishing, too. He even walked on water to get to the boat!
Currently without a SeaCraft 
(2) Pompano 12' fishing kayaks
'73 Cobia 18' prototype "Casting Skiff", 70hp Mercury
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