I purchased at 2001 390 2 years ago. It was well maintained, I am fortunate. Single Cummins 330hp. 2 leak issues. Pay close attention to caulking on rubrails. Tends to allow water to run inside of hull. Also, the drain tubes in the flybridge port and starboard seating tubs are poorly designed, allowing water intrusion into salon headliner. Need to keep those tubes well caulked on inside and outside of tub.
12 knots is a stretch, WOT. Boats runs comfortable at 9-10, 1,800 rpm.
Take the leap! 7 month a year live-aboard with loop plans as well!
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2001 Mainship 390