A: I'd say you could get them around a 1-1/2" post.
A: The braces do not connect easily because the bolt is only as long as it needs to be in a perfect world. The bolt holes should be oversized so the bolt can get started at an angle if needed. I mean to an engineer its an obvious change worth doing to make installation easier. The braces also does not hold the posts in a square and plumb position. Basically the braces suck
A: Yes, but you can't see to tighten the clamp at the bottom if it is in the water. You have to do it by feel.
A: No, it is not recommended to cut the support brace.
A: This product includes one item.