I had a heavy duty 4m Ramco with a 30hp. Was a dream with 3 POB but a bit tail heavy by myself, I shouldn't think that would be a problem with a pontoon. My best guess would be to go a bit bigger, 40 & 50hp Mercs are about the same weight so I'd probably got to the 50 if your budget allows as you may carry a lot more gear than I ever did.
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