Re: 3 hp strong enough?
I use a 4hp on my 14' Lund aluminum. The entire boat & gear and a couple of big butts is about 1000#. The four works great...I would also expect the 3 to troll nicely. It just depends on how much throttle you want to use.
When I used to race my 21 foot sailboat, I used a 2hp kicker (for purposes of lightness) to get out on the race course. The motor wound up but pushed the boat as fast as my 10hp honda due to a non planing displacement hull.
With a smaller motor, your only concern is wind, waves, and tides (if they apply).
If your boat does not weigh more than my lund, I'm sure a 3hp kicker would be OK for a troller. Any chance of trying before buying???
MAS