tailgate

A lot of the covers will overlap the tailgate and lock, thus preventing the tailgate from opening when the cover is on and locked.

The "Honda" name brand hard tonneau cover has an adapter that mounts on the tailgate that locks into tonneau cover and tailgate on the right side of both units.

I know a company that makes a quality tail gate lock that will lock both motions of the tail gate at the same time you lock your trucks doors.
They also have a manual lock that also will lock your tail gates both motions with a key.
The mechanism mounts inside your tail gate and doesnt interfere with any tonneau cover, and you wouldnt even know its there.
The keyed lock will have a key hole under your existing tailgate handle.
Very easy to install.

I know a company that makes a quality tail gate lock that will lock both motions of the tail gate at the same time you lock your trucks doors.
They also have a manual lock that also will lock your tail gates both motions with a key.
The mechanism mounts inside your tail gate and doesnt interfere with any tonneau cover, and you wouldnt even know its there.
The keyed lock will have a key hole under your existing tailgate handle.
Very easy to install.

I know a company that makes a quality tail gate lock that will lock both motions of the tail gate at the same time you lock your trucks doors.
They also have a manual lock that also will lock your tail gates both motions with a key.
The mechanism mounts inside your tail gate and doesnt interfere with any tonneau cover, and you wouldnt even know its there.
The keyed lock will have a key hole under your existing tailgate handle.
Very easy to install.

I know a company that makes a quality tail gate lock that will lock both motions of the tail gate at the same time you lock your trucks doors.
They also have a manual lock that also will lock your tail gates both motions with a key.
The mechanism mounts inside your tail gate and doesnt interfere with any tonneau cover, and you wouldnt even know its there.
The keyed lock will have a key hole under your existing tailgate handle.
Very easy to install.

OK OK got it J/K
do you have a link to their web site?