it looks in the photos like the wire run from the tcm into the tailgate is a single solid copper core not stranded cable. single core cable will break eventually from fatigue where it flexes when the tailgate is opened.
The reason only 1 foglight is used is so that in foggy conditions the brightness of the fogliht can overpower the brakelight, so only having one foglight means that at least 1 brakelight is visible. not so much of a problem now we have high level 3rd brakelights but still done by some manufacturers.