Thanks to Enigmaaron's post and chat, I was able to install the MX4 using the brackets from RO. I did have to cut a similar portion of the covers railings like Enigmaaron did as the bracket is about a 1/4" too thick for the railing to sit flush with the bed sides. I also tried to put the cover railing behind the bracket which might have worked if you drilled the mounting holes on the bracket a little bigger but decided against it. Cutting the MX4 railings to fit around the bracket was the best option and everything fits like it would if I didn't have to work around the brackets needed for the MFTG.
Curious to see how dealer installs yours Dallasfan so let us know how that goes!
BTW...ordered the Bakflip through Brittany Marie (
www.accessory.parts) who you can find through FB. Easy to work with and got the best price available with super fast shipping!