I have some common running lights I've used for...maybe 40 years. Amber lenses. I saw one in NM that had installed what looked like bright amber LED lights in the round rolled part of the bed (really easy to see...at eye level). However some LEDs don't like to flash without adding some resistance.
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~ Jon
1952 1/2 ton with 1959 235 | T5 with 3.07 rear end