Original harnesses had round, black, 2 piece crimp-on connectors (commonly known as bullet connectors) for the tail light wires. The tail light came with a pigtail long enough to reach through the frame to where the harness wires terminated. Some of the vendors sell a deluxe tail light which has this pigtail with bullet terminals on the wires.
I'm familiar with this sort of bullet connectors from working on various British cars over the years. When properly made & assembled these worked well. I have seen on aircraft some very nice removable connectors and can see no reason why something like this wouldn't work well on a truck that will probably be around as long as gasolene is still available. These trucks have survived their junker days and are are going to be prized, maintained and driven until that awful day.
