What are they and what do they do and do they go between the transom and jack plate? I am guessing that they are a more inexpensive way of having more set back on your jack plate without having to change jack plates, correct? What advantages and disadvantages do the set backs make? More set back is faster, but slower out of the hole and with heavier loads?

When would you need trim extenders and how do they attach? What are there advantages and disadvantages?

Thanks guys.