One sees a lot of '48 Chevy and '38-'39 Ford repop tail lights on tears and other wee trailers. Have you ever seen the Lincoln Zephyr lights? These are stainless, LED, and resemble the Ford lights, but are bigger and brighter they are something like 7 1/2" tall ! You need visibility? Don't want to get rear ended? These could make the difference. Speedway Motors.
http://www.speedwaymotors.com/1938-1939 ... layId=9876
Shiney Hiney has them too. They also have the round Willys tail lights. If you look at them you can see they are meant to be mounted on an inclined surface (back of the fender?). I'm thinking third brake light on a tear centered somewhere above your license plate. Even more "conspicuisity" when you apply the binders.
http://www.shiny-hiney.com/rodcustom30.html
These Lincoln (and their Ford) lights have what they call "rapid fire," where the brake light flashes rapidly twice when you first apply the brakes, and then stay on steadily. You may have seen similar on motorcycles. Another good feature. PLUS, I think the Lincoln lights use the same mounting hole spacing, making for an easy upgrade.