I added a Retraxpro XR bedcover last weekend and so far I'm pretty pleased with it. Next up is an overland bed rack. I think I prefer the functionality and looks of a rack rather than just crossbars but I also want something low to mid profile so I can pull my truck into the garage with an RTT mounted (IE not sticking up a foot above my cab). I also want to be able to mount maxtrax, etc. to the side of the rack. So I could go with a KBVoodoo or RCI rack using their tonneau bracket adapters. I haven't ruled this out, but it does seem like that might be a bit silly to go that route after spending the money on the XR rails. Using the Retrax tracks, I think the current options are pretty much a platform like the Frontrunner or Rhino-Rack Pioneer. I guess I'm leaning towards the Frontrunner because I like all of the accessories they carry, but it's pretty damn expensive so I'm not totally sold. If anyone has any other options that I should look into I'd love to hear about them.
However, I may have recently found another option for those of us with the Retrax XR covers. The company is called upTop overland and they make a bed rack that I personally think is pretty great looking and has more of a traditional overland rack look. The have two rack heights (mid and high) and currently have an option for no bed cover and one for the Retrax XR covers. Here's the mid height with no bed cover:
And here's the tall one on a Retrax XR bedcover
Currently they only make these for Tacomas, but I've been in touch and they've assured me that an F-150 version is "at the top of their list." No whether that means a month from now or a year from now, I'm not sure. But if anyone else is interested, I recommend you contact them through their website and express your interest. Perhaps if enough of us do, it might push the timetable forward.