[ijames]

Thanks anyway. I have a pickup, and just built my first ever ecomod - a partial cover like you built that covers the rear 45% of my bed and sits on top of the rails. Have only had it on for 1/2 a tank so no data yet on the effect. One day I'll find a way to test my toolbox idea. Then I just need to market a toolbox with a wedge shaped lid and call it the aerobox or some such, and I'll be rich :-). Botsapper pointed out a toolbox from Delta that mounted on rails so you could slide it to the rear for easy access, but it is discontinued and I think their intent was to always roll it back forward when driving. Oh well.