First of all check out unofficial four winns forum at
www.ifourwinns.com.
Second consider a chartplotter that takes C-MAP cartridges, if you plan to use it on Winnipesaukee. The Bizer chart is best on C-map. I have the Northstar M84 and love it.
My Dad had a 5000 lb Four Winns on a roller trailer and never had an issue,
but that's just one data point.