Re: Trolling motor size for 18' Toon
Yup, 55 is the biggest you can get in 12 volt and that should certainly be enough to get you sround, even with current.
I have a 55 lb Motorguide on my 16' aluminun fishing boat and it will move right out and the newr trollers are pretty gentle on batteries.
Thye other cansideration is shaft length, get the longest you can, remember, in a wake the boat can bob a foot or more out of the water.