No, not a 50 footer - we all wish! Rinker's biggest hull was about 40 feet. Remember that the "model" number rarely equates to measurable length. There is also the LOA debate.....hull v.s. hull +swim platform/anchor etc. Rinker last made the 400 in, I believe, 2014. I was actually on and considered buying the last EC 400 ever made. I wish I had bought it. Rinker's biggest boat now is the EC 370 - that does not mean the hull is 37 feet long because it is not.
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http://rinkerboats.vanillaforums.com/discussion/3483/finally-wet#latest
http://www.seamagazine.com/rinker-420-express-cruiser/