What model are you installing?I boat on a fast tidal river too.
During the boating season, the water stops moving twice a day in the daylight for about 30 minutes.
I'm installing a bow thruster on the 27 H&H as part of the refit.
I'll be 67 yrs old next month.
Going forward in years I figure I won't be getting any stronger physically to hussle the boat on and off the docks in the wind and current.!