David:

In my case where I tie to the dolphin bar, I did not need the limiter; but I could see how it could help. I manage to work it fine without it.

Both Rick's 18 and my daughter's 16 has limiters on them that are attached to the rear crossbar; we just added bungees to keep the limuter's taut when not in use. The bungees are attached somewhere in the front crossbar area.

Wyatt