According to the manufacturers recommendations, yes.
The 315 is rated for 4000lbs rolling load, or 1650lbs vertical lift. Keep in mind though that it's a strap winch, not a cable winch, so you will not be able to double your pulling power by using a snatch block at your bow eye like you would with a cable winch. However, unless you are going to be launching at exceedingly steep ramps the 315 should be more than enough to retrieve your boat.
you can find all of Powerwinch's current models and ratings here: http://www.powerwinch.com/powerwinch...ler?action=faq
Hope this helps.
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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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