Same as all the other replies.. Both of my boats sit about 0-3 inches max from the last roller. You don't want to go too far forward because the hull can actually slip off the last set of rollers that way. I'd guess 3" is just about perfect. 
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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.
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