Thanks for the replies.
I tried attaching fenders to the dock, unfortunately it did not work out. Where I dock is an estuary with significant current, and sometimes I over shoot my spot.
The fender lines "saw" up and down on the rub rail, so I am trying running the fender line through a piece of clear plastic hosing. The line runs up and down, while the plastic hose stays still.
Seems to be working so far.
BobG