I have a Berlin tonneau cover that snaps on/off and rolls up.
I also has the tilt up option which I love.
It is made by a small Amish shop near me in N.E. Ohio.
It is typical Amish design, very sturdy and well built with no fancy hardware or trick installation.
Hinged aluminum frame the mounts to the bed tops with C clamps, no drilling.
I drove to the Amish shop and picked mine up myself but they are sold by a number of distributors in the US.
Here is a link.
http://www.ebay.com/itm/Berlin-Hinged-Al...=item1c09cbde81