Each half has a lock knob and each lock knob can be locked with the included key (two are supplied). Each lock knob has a cover that closes sealing the lock cylinder from the weather. These are a friction seal, with a lip on the top part clicking over a lip on the bottom. These were so tight on my cover that I filed them down slightly to make opening the cover over the lock cylinder easier.
One of the main elements of this cover's design is the center pivot points.
Each half of the cover has an ear that engages onto the post of the center pivot mounted on the bed rails. When one section is open the other section's latches and engagement of the pivot post are what is holding the cover to your truck. This is why you can not open both sides at the same time.
This also makes removing the cover very simple. To remove the cover you simply:
1. Unlock both locks
2. Open the section behind the cab onto the section at the tailgate.
3. Pivot the rear section's lock knob to the unlock position.
4. Raise both sections and pull toward the rear of the truck.
Pulling the cover back about two inches disengages the cover from the pivot. You can now pick up the cover and completely remove it.
I have done this by myself, but it is easier with a second person helping you. The cover is not heavy (about 45 lbs.), but it is awkward. It also tries to open when you are handling it. I am going to make some clips to secure the two halves together in the open position to make it easier to handle.
In my experience it is easier to remove the cover with the tailgate open and with all of the hooks for the tie-down system removed from the rail between the pivot point and the tailgate. I slid the cover back, picked it up and slid to the right, then lowered the side not resting on the bed rail down onto the truck bed.
A note about the mounting hardware: after I got home from the dealer who did the install I took a hacksaw and cut off the excess length of bolts used to attach the hardware to the rails. The ones on the center pivot were almost touching the ears on the cover. I cut the others off just because I thought they looked better without the excess sticking out.