I hang my fenders from these since we typically aren’t at the dock long enough to tie up, just dropping off or picking up people (unless we are at the in-laws lake house for the weekend).

Easily adjustable to account for dock height or if ballast is full/empty.

Nite Ize CamJam Cord Tightener 2 Pack With 8FT of Paracord, Lightweight Plastic Tie Down Cam Mechanism With Carabiner Clip + Cord https://www.amazon.com/dp/B007RQ3MSC..._5HdvDbRBK78T2