It all depends on what you're comfortable with. The rod length change 2 things mainly;spread width and distance from the trolling motor. For the length of your boat I would think you wouldn't want more than 12' so they can be carried inside the boat when traveling. 10's might do fine also. It's fun, especially when it's busy and you can't hardly keep up with 3 rods. Good luck, some of these folks have done it lots more than me and will help you out.