How to stabalize a aluminium tender (repost)

[Dave_S]

Looking to add stability for the tender and protection for the other boats. The boat collar looks perfect but at $1,000 for a 12" tinny it seems a lot.

Does anyone have one ? Or recommend another option.

https://youtu.be/9Octqbs4B8Q

Kapten Boat Collars - the best stability & performance-aid for small boats

[UNCIVILIZED]

Multiple large diameter cylindrical fenders around the boat's perimeter attached so as to mimic a collar. Done right, it adds a lot of volume, & thus floatation.