Now I was thinking I would mount the front and rear Dually D2’s on the side rails the same way the rack is mounted. So I picked a piece of SS plate and cut it to the same width as the lower rack mount so it would angle down between the rails ( or slide in the ends).
I drilled and taped the lower plates. I then used a wider piece for the top ( with holes drilled to line up with the threaded lower plate). This would become a homemade sandwich type clamp with a mounting surface that could be made to go in any direction and length.
For the rear I was thinking I could mount D2’s on top of the bar or I even considered having the bar long enough to mount the light below it. The SR 10 would be mounted on the rear of the back rack.