I've always wondered why the guys who fish the salt use the gunnel rodholders so much.
Here on the great lakes we use tube rodholders almost exclusively. There are many different manufacturers at different quality and price points. Below is a link to perhaps the most well made products available. They also have a lifetime warranty. Locally made right here in Cleveland, Ohio U.S.A.
https://www.ciscofishingsystemsltd.com