There are better options than 100ah batteries in parallel. How about one 4D or 8D? Or two GC2 or L16 6v batteries in series? Yes more amphours is beneficial since for a given discharge current, the Peukert penalty is smaller. It's not a real deal breaker though unless you cruise at relatively high power levels.
Why a 12v motor? There are plenty of inexpensive 24v and 36v motors. Check out the Newport Vessel line. Cheap. You will want a PWM brushed dc motor controller for more efficient operation but a cheap Chinese controller shouldn't cost more than $40 or so. Then gang up some reasonably high amphours batteries in series and you will have a very capable system for a 19ft boat for a fairly low investment.
As someone else suggested, you can always just switch between batteries when the first one is down to 50% or so. The Peukert penalty is not going to break you at modest power settings. It is more important to have a PWM controller, actually.
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