Greetings, is there any reason and/or way to secure my Extang Trifecta against theft? ....that is to say, theft of the cover itself. Thank you.

 

You could replace the handles that tighten the cab side clamps with nyloc nuts. That wouldn't make it theft proof but it would mean the thieves would have to figure out that they would need a tool and it would take longer to unmount. Sometimes slowing them down is all you need to do to deter them if they're targets of opportunity thieves.

 

I have the Solid Fold 2.0 and I lock my tailgate.