If you pull planer boards your rods need to be the same length so you can shuffle them front to rear while landing fish when using multiple boards on each side. You need different length rods when NOT using boards off the side of the boat---16-12-8 or 14-10-6 etc. on the rod lengths.
Go to the fishing website The Next Bite and watch the videos, and read the articles. The walleye guys use planers all the time, and can offer Much Better advise on them.
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