I've used both 6 volt and 12 volt LED in my tail lights. I couldn't get off the shelf 6 volt bulbs that fit in the pencil lights but did in 12 volt. I also replaced the lens cover with the "Jewell" type found in Hot Rod shops, they make the light stick out a bit more for seeing at an angle and the LED lights are clearly visible on the brightest days.
More recently on my trailer I set up a pair of magnetic tow-truck taillights with turn signals. Stick them on when traveling and stick them underneath when on display or parade.
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