This little video-ible shows a trolling motor plug and receptacle as well as a 2 battery set up for an old Venture 17 sailboat.
The run time has been a nice added benefit of having two batteries wired in parallel. The trolling motor is a 12 volt 55# thrust motor. With the motor set on the highest setting the 1,000 (+/-) pound boat will go almost 4mph for about 3.5 hours. Slower speeds will last all day.
Thanks for watching.