motor

So I'm looking at buying my first boat, used. I know that the boat has to be registered within 90 days, and the trailer must be transferred over to my name ASAP. What I want to know, is what I must pay taxes on. I've read in other forums that I should get separate bills of sale for the boat...

I am surprised how little information there is on these motors. Can anyone speak to the reliability of the digital maximizer and how it affects battery run time? I just purchased my first motor, a 40lb thurst Endura Max. I'm using it on my 10 foot plastic boat which I know may be overkill but...