Weather sealed, modern connectors, do work well on aircraft, spacecraft and modern electronic automobiles using signals to operate. They are used because many of the aforementioned entities are built in sub assemblies, in various parts of the world. They need to be pre tested. They need to connect together at final assembly quickly without soldering. Many use technically advanced connectors way beyond our needs or ability to acquire. These various vehicles do not use any more connectors or connections that are necessary. They go out of their way to eliminate all wire.
Wiring protocol, experience and logic says: the less wires and the less connections, the better. A bunch of connectors are not necessary to wire up the lights in the area you mention. Not desirable for assembly, maintenance or reliability. A future owner will not find it a pain to redo a few simple wires on an incredibly simple old truck's rear wiring. The original bullet connections may have been to facilitate mating the harness to rear light assemblies on the assembly line. Not for maintenance. Assembly line speed/cost savings were the goal. Keep in mind, you are not on an assembly line and straight wiring has less reliability issues. Your desire to use connectorization is OK, but your reasoning for it is not factual. You may end up with many more solder joints or crimp joints. It's your choice and it's right for you. You don't have to convince anyone. My opinions are just opinions, sometimes based on experience with building old trucks and what field of work I came from. You have said you are a novice to electrical. ("this is pretty much a new frontier for me".)
I advise to K.I.S.(s.)
