30 pound thrust should be fine. I have a 40 lb thrust on my 15' aluminum boat which weighs around 1200 pounds with two anglers. If you go to the probassshops.com web site there is a guide for trolling motor thrust for bass boats. But you'll be fine with the 30 I think.
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Mike, Editor
www.washingtonlakes.com "Featuring readers lake and saltwater reports."