Mounted the 48" HiLift "ladder" to the roof rail. I have a short HiLift inside the truck. This is just in case some extra lift or pull is needed that the short one can't provide.
It was an easy mount. Used two OEM rail tie downs (top center) and removed the thread insert that goes inside the rail. They use an M6-1.00 thread. For the two rear mounts (bottom left) I used a 40mm long bolt, a 1" washer, a 1-1/4" rubber washer, and a shock bushing I found at O'Reillys. That's all threaded to the OEM tie down threaded insert. The HiLift "ladder" is sandwiched between the rubber bushing and rubber washer. The bushing keeps it off the rail and absorbs vibrations and bumps. For the front mounting point (bottom right), which is the recessed mounting point used to hold the plastic rail molding down, I used a 60mm bolt, 1" washer, 1-1/4" rubber washer, and the two remaining rubber bushing front the shock kit. I had to sand the rubber bushings to a square shape so it fits in the recess. One of the rubber bushing fills the recess and the other stacks on top to keep the "ladder" off rail like other two mounting points.
Here's a pic of the shock bushing kit I found at O'Reillys. It was perfect because the two large ones were used for the two rear mounting points on the rail. The two smaller bushings were sanded square and stacked for the front mounting point which is recessed.
"Ex Umbris Venimus"