PhantMan:
I'm assuming your boat is an outboard, right?

"JimH" wrote:
No. It is an I/O.

Then you don't have as much weight bearing directly on the transom and
can get away with hanging a little more transom out there unsupported.
A straight inboard might get away with even less transom support.
Don't get me wrong, I'm not advocating removing any available support.
Just pointing out that one requires more support than another.

On the other hand, since you're only storing it, you might get away
with blocking under the transom (or engine bracket) and cranking up on
the tongue jack thus supporting much transom weight with the ground.

Please explain.

A boat can develop a "hook" in its bottom after years of storage with
unsupported weight on its transom. Yes, outboard boats are commonly
stored in racks like that but that doesn't make it a good idea
especially when there's a simple alternative.

What I'm talking about is putting a concrete block with a few wood
blocks stacked directly under the transom, before you disconnect the
trailer tongue from the hitch. Then disconnect and crank up the jack.
The transom will lower itself onto the blocks and you've just
supported the transom weight with the ground instead of leaving it
hanging. - pretty simple-

Is that what you meant by "please explain"?

Rick