As a general rule of thumb, most manufacturers recommend 5 - 7% of the total weight of the boat, trailer and engine as the amount you should set as your tongue weight. Understand that this is a guide and can be offset by additional factors such as gear, fuel, ice, etc. Generally speaking though, it's always better to have a little too much tongue weight than too little. Too little tongue weight leads to swaying and fish-tailing at highway speeds. Too much and the tow vehicle can become difficult to steer. But it's always been my experience that fish-tailing at speed is far more dangerous.
Compliments of Boat US is this handy guide on how to determine your tongue weight, both by using a commercial scale or by doing it at home using a beam scale you can make. http://www.boatus.com/magazine/trail...weight-diy.asp
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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