First of all, I did search and found nothing (Searched with: Booty Bay Boat, Booty bay, On top of boat, rocketboots bootybay, rocketboots boat). If this is a report, please feel free to post the link to the original thread and I'll delete this post (if I can).
So this is basically a way to get on top of the boat that travels between Booty Bay and ratchet. You can do this without rocket boots xtreme but you cant get to the very top without using them (Not 100% sure about that one though).
It would've been harder to explain this with pics so i made a vid:
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Was thinking about it while i was Thunderstorming alliance players off of the boat, thought I'd share it. Enjoy (if its not a repost ofc)