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I noticed a different swing tongue set-up on the trailers that North Shore Marina (our local Boston Whaler dealer) is using. This is a bolt on kit while every other swing-tongue set-up I saw was a welded affair. When researching repairs to a trailer I once had the advice I received was to bolt all connections - not weld. The reasoning was that for items that get the kind of jostling that a trailer does, a bolt-on connection is more reliable. I don't know why this is but it is what I was told.

Here are some pics:









A quick search found only 1 source for these - Northern Tool. I couldn't even find them on Fulton's website.

Here's the blurb:
Fulton Bolt On Pivot Coupler Kit. Fold-away coupler shortens length of trailer by 2-" for storage. Fits 3 in. x 4 in. trailer tongue. Class III; handles 5000 lbs. Models 22200, 1281, 128120, & 128123. U.S.A.

Mfg Warranty: lifetime warranty