This post is a little old, but just saw it. I have a Pace Edwards electric bed cover on my 8' bed. It's a solid slat cover that rolls up inside of a canister on the cab end of the bed. It has a bed switch and a remote control. Installed it in 2012, and it has given very good service. A little pricey at about $2k in 2012.
2017 36RSSB3--2012 F350 KR, LWB, SRW, bilsteins, 1 1/4" anti sway bar, bilstein steering stabilizer, airlift air bags, on board wireless compressor, 295/20 tires at 4080 pounds each, oversized finned aluminum diff and trannie pans, all synthetic fluids; KEM, Tyrant, and PIP tunes with SCT X4 programming, G37 2017 Turbo, ATS Stage I towing transmission and torque convertor, Edge CTS gauge monitoring.