Mine's a Boss Lock electric one that activates with the power door locks. Pretty slick. Simple install.
I see generic door lock solenoids for sale on ebay real cheap and, if I ever get the time, would like to hook one of those up to the topper latch to work the same way. It would be easy to do. Everything would be locked or unlocked at the touch of one button or with the alarm remote.
I recently bought a used Lund Racerback and will need to surrender my topper and go with a tonneau (or nothing at all) once it is painted and installed. Remove ten screws and it will come off and allow for topper use again, though. I had one on my Chevy years ago and they look cool imo. Good place to mount some lights, too.
Of course, the topper has been green since I bought it six or seven years ago and my truck is maroon... Yup, I'm a redneck fashion statement on wheels! I only use it for hunting season to keep the dog warmer or on trips where we have luggage in the back. I see another guy running around town occassionally who has a green truck with a maroon topper... We need to stop 'n swap!
If you remove your tailgate to work on it, don't lose the little plastic bushings on the hinge posts or you will have rapid hinge post wear and terrible rattling.