I've used Tear-aid with lots of success as long as you follow the directions. Clean the area real well, apply some warmth to it (hairdryer) and use good pressure to apply.
There is one ramp on Lake Cumberland (KY) where I experience the same thing. I launch solo so I have to back in far enough to pull off without anyone dumping me in. The ramp is very shallow most of the year. This is of course fresh water. My jack has the black plastic cap so I can remove and...
Can't tell from the diagram, I'm an A1G2 guy. Is the tab washer you reference above the one that locks the prop on after it's tightened? Just tryin to understand. So it's believed with a counter rotating prop it spun loose and this is what caused the water intrusion?
I'll add bellows, shift cables, u-joints, alignment, breaking trim sender wires, multiple avenues for leaks requiring yearly drive pulls and the ability to be a circus contortionist.
The 2004 Lexus talked about in my original post had a camera but was small and not very clear so I never used it for backing the trailer. I did use it for hitching up.
Not a deal breaker, just wondering what to expect if I go that route. I suppose the same could be true for a modern SUV also. Views out the back are getting less and less and relying more on cameras.