With your deepV I would be equally concerned about shaft length since your considering pulling cranks which is usually done from the middle or back of the boat. I would strongly suggest the 60" version. (you can always lower the collar to shorten the shaft when needed) Shorter lengths will have your TM spinning in the air on windy days when using an auto-pilot. If decide on a 55# Troller you could also run a second battery in parallel to give you the duration you need instead of pulling power required for a heavier boat. I have a deepV and learned from experience.