That is quite a contraption! We had a nice looking wooden (amazon) towel tree thing for a while but the wind kept knocking it over and it slowly lost limbs until we threw it out. I've seen a few people with little magnetic hooks attached to the pin box to hang towels and stuff. Next time I'm at harbor freight, I plan on grabbing a few packs of them.
You could sell this gizmo!
Call it the “Sea Monster“
only thing is most parks don’t let you hang towels?
but in state parks and dry camping it could be real handy. i like the magnet idea.