I gotta ask, why the cab and not above the tail lights or in the tail gate?
To me highest spot isn't always best, but I don't deal with the same conditions as you might
I originally was going to put them above the tail lights. I decided against it for a few reasons. One, that is a lot more wiring and installation. Two, I wanted these as high as possible on the vehicle. From my experience dust and snow is the most dense at the lower levels because that is where the vehicle is kicking it up. There isn't as much for the light to have to cut through the further up you go meaning that you are more likely to be seen and at further distances.
tube this is Wilson dammit
Lmao. Thank you for reminding me.
Added some night shots to the OP.