I run contrary to the popular trend when it comes to parking of the service vehicle for highway work. I park right in front of the casualty.
My personal belief is that people don't care if they see a tow or service truck, they won't move over. I do believe they are *somewhat* more likely to move over if they see a human being working. So I feel if I park behind, I feel drivers are going to see my truck rather than me.
I do have the advantage of having rather tall vehicles, so my Arrow-Stik can be seen over almost any casualty. Plus my ex-ambulance / service truck still has all its working lights that I can use if necessary. Even the high beam wig-wags still work.

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