I wish to put in a boat lift under a covered dock. My boat is a plain vanilla 16 ft. aluminum boat weighing about 300 lbs. empty. A vendor suggested a jet ski lift with either manual or electrical power. I probably need to put in a sturdy stainless ladder as well. Water fluctuates up to 5-6 ft. (sigh).

Questions: Is that the ticket? Would the cradle have to be lenghthened and how is that done? Anything I missed? Is this a DIY or bring in a pro? Concerns?

Please and thank you.