Re: Flipping your boat over ????
Put some cross-members across the trailer.Secure them. You will have to get them under the boat. Pad them with something so you don't scratch the finish. Once you have the boat up off the bunks and/or rollers, slide it to one side but not too far. Roll the boat up on one side and over on it's top.
That is the simple explanation. I haven't accounted for size,weight, what's on the deck,location, etc.
Unless this is a small boat you're going to need help. Maybe some overhead
lifting points. You might want to tie down the trailer or have it hitched to the
truck.
There are a bunch of posts on this forum with pics covering this subject.
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option. GH