Now to the S2 mounts onto the back bumper. This was a bit of a challenge. I ended up not directly following the instructions/recommendation. Because of the challenge and frustration, I forgot to take some pics of the mounting. So I'll try and describe some of the difficulties. The instructions stated to attached the bracket with the side tabs towards the top. See pic below of instructions.
I'll explain why as we go, but I decided to rotate the bracket 180 degress so that the side tabs were more towards the bottom. What's extremely difficult is that it is tough to get to the main bolt that holds the bracket to the bumper if the S2 has been installed on the bracket. And if you mount the bracket first, then you can't realy install one of the side bolts into the S2. See pic below which shows how cllose the edge of the bracket is to the side of the exhaust tip.
You can't really even get an allen wrench in there to fully tighten. So I found that rotating the bracket 180 degrees with the side tabs lower, allowed me to point the S2 light down the ground and just barely have enough access to the main bolts that holds the bracket to the bumper. So what I ended up doing was mounting the S2 into the bracket first and tightening the side bolts pretty snug. Not too tight since I needed to be able to rotate the S2 and point it to the ground. But made it to where it took a little force to point the S2 downward. Oh and it's easier to put the main bolt into the bracket because the washer is pretty big and tough to get in if you wait until after the S2 is mounted onto the bracket.
So then I rotated the S2 down towards the ground and mounted the main bolt into the bumper.. You really have to push the wire out of the way to get the torx bit into the bolthead, but it can be done. After tightening that main bolt good, I rotated the S2 to point to the rear. Then I tightened up the side bolt opposite the exhaust tip near the recovery hook. You can get to the bolt head with an "L" style small allen wrench and really tightened it up so it wouldn't rotate any more. The S2 seems to be staying firm and in place now. So I think it's tight enough. The S2 is slightly can't to the right, so I'll probaby have to adjust again. Thought I had it straight, but looking at this pic I can see it isn't quite level.