I just set my motor on the little metal lever that is factory issue with the engine. I’m guessing this is not an option on larger motors, mine is a 50hp. I used to piddle around with transom savers that attach to trailer and the rubber V notch always broke and the ones with the metal V and rubber stoppers cost like $60. I Decided to just trust the factory lever about 3-4 years ago and haven’t had any trouble (that I know of). And I put a LOT of miles on a boat trailer