Insomnia struck again, so I got up early and put the tube lip on my airdam. I ended up drilling holes through the rubber tube, putting a rivet though the inside of the tube through the conveyor belt. I used a washer on the back side to expand the rivet into, so it wouldn't just pull through the conveyor belt. Made a pretty solid connection, and the fasteners semi-hidden from view.
I need to put something over the end of the tube to hide the gaping hole for cosmetic reasons. It is also getting about time to take it off and paint the aluminum. I am about ready to call this project "good enough for now" and start working on the bed cover.
Any thoughts, suggestions, or ideas are welcome though.