My Tractor Supply brand is Blazer 12v LED lights, but I made a civilian/military tow light set with some scrap angle iron from a round bale feeder the horses destroyed. Even though it stated 12v and not multivolt, it has worked fine for over 9 hours (440 miles) of travel, and about 6 hours was fulltime after dark while recovering two M818s. Of course, they could die after 10 hours, but they work great now. I'm using the 4-flat wire to tie into the military plug as discribed numerous times here. I think they cost around $44 a set of the bolt on. Couldn't find any magnetic Blazer LED light sets.
These photos are for a tractor, but for cargo trucks, I just need to flip the lights on the angle iron and use the C-clamps to attach to bumperettes. This setup is a lot easier to use than the military tow light set with the straps and heavy cables.
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I apologize for the crappy photos, I need a decent camera.
http://www.tractorsupply.com/en/sto...ailer-light-kit-for-trailers-under-80-in-wide