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stupid
Very insightful. Thank you for your input.
Honestly I am not sure how well a little 30mW 532nm would work but You could use a 100mW 532nm module and add a small line diffraction lens to it for about the same price as those two small ones:
100mW 532nm Green Laser Module (3V 11.9mm) - Worldwide Free Shipping - DX
AixiZ 60° Line Generator for 12x30mm Housing, AixiZ
These could be made into a low profile waterproofed case with several high powered neodymium magnets behind a rubber layer to hold it in place and be remote activated by something such as this:
Wireless Remote Control Switch Set (DC 12V) - Worldwide Free Shipping - DX
Power for the remote trigger and laser could be 3/6/9 4.2V batteries with a driver designed to drop the voltage down to 4.2V for the laser module. You would likely get hours of runtime off this setup per charge and if made well it could take some serious vibration without damage.
A 100mW module could pose problems if you use it while rolling but all you would have to do is slow down and maybe stop and wait for the road ahead to clear before you flash it on.
I think the idea of using a laser is awesome and I am going to pitch this idea to my Dad who is a truck driver also.