Hi JeanF. Welcome to the site. To answer your question, I use a 9.9hp Honda 4 stroker and it does the job fine. Don't forget, the primary job of a kicker is to move you through the water slowly. I truthfully think that most trolling applications you could get by with a 5hp. I mean really, what does it take to move the boat 1-3 mph? Not much I'll wager. I completely agree with MJ that a 15 is all anyone would need. 
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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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