Our new truck doesn't have a tonneau cover for the bed, and we're thinking that it would probably improve aerodynamic performance (and mileage) if it did. Does anyone have experience with adding one ...
It depends on the truck. Does truck have rail protectors on it? If so get a under the rail opposed to the over the rail Drop in liner. I personally prefer spray in liners like linex. Linex will not affect your choice of tonneau covers.
Back to tonneau covers... One of my concerns with a roll up tonneau cover was how much snow load it can handle. I'm happy to say the Access limited has handled 12+" of heavy wet snow With no issues. I'm very impressed with the cover.