I just installed an Extang Black Max on a 2004 Tundra Double Cab Limited. Bought Black Max because it snaps at the cab also. Easy install and it looks good. Also installed Weather Tech window visors because they go in the channel and don't use double stick tape that never holds.
In addition, I'm in the middle of installing an Auto-Dimming mirror with Compass and Temperature. According to Toyota and every place I have looked, one is not available for the DC. Don't know why other than the little strip from the mirror base to the top of the window is "a little short". Too bad but I really missed my compass and dimming mirror so I am doing a little rigging to make it all work.

Does anyone have any comments or suggestions?