It was a very straight forward install. No special hardware needed. It did help to have my son to help me mount the bars and raise the tent. Without help, you'd need very long arms to put the mounting bolts through the tent floor and attach the washer and nut on it under the tent. Pick the side you want the tent to open to. Connect two of the cross bars to the bottom of the RTT before you mount it. Once the RTT is on the rack, lift one end of tent an place the third cross bar between to the attached to the tent. The middle bar is only attached to the rack, not the tent. It is there to bear the weight. It's getting dark now. I will take some pictures tomorrow of the cross bars and mounting brackets.
I also have the SmittyBilt awning. It is well built and I have the below tent annex. Regarding the awning, the brackets it comes with are L-shaped and are so-so strength wise. I replaced the SmittyBilt brackets with the Gobi brackets. The Gobi brackets are super solid but VERY expensive. Personally, I think they were worth it.
I saw a loss of 2 - 3 mpg with the RTT. With the rack, tent, 4" lift, 35" tires I get about 13.5 - 14 mpg.