I was worried I'd have to drill into my bed rails, but this kit uses the existing integrated tracks so it's basically bolt-on. Now my rack sits solid over the tonneau cover and I can still load lumber without pulling the cover off. Took maybe half an hour to install.
The kit bolted right into the tracks on my bed cover and the fit was spot on, no drilling or fiddling. Now I can run the rack and still keep everything under the tonneau locked up, which is exactly what I needed for hauling lumber and camping gear.