Doc I believe you are referring to the traffic advisory lights? Those deck mounts are the ones used in police and fire vehicles. If it is those they would be bright. Not sure how you would secure them and whether or not you might get some reflection inside the cab if placed inside. I had previously considered something like that but figured the kids would mess with it.
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For those who did the pre-run, do you think a pair of Whelen Vertex ambers mounted high on my WSI light bar provide enough light for the truck behind you? I am recycling a pair if amber D2 from my old setup and could mount them up there too. That would be pretty bright though and definitely would have to aim them down.