What kind of tonneau cover?  How confident are you with your DIY skills?  What's your budget? I installed my Harbor Freight Haul Master 800 Aluminum rack over my roll-up tonneau cover, but it took some manipulation of the tonneau cover.  I had both already, and a new truck required a retrofit.   Otherwise, you're looking at the   (You need to Login or Register or other sliding rail mount bed racks.