trailer grounding

Personally I'd like to see this "standardized" across the board. Seems to me that since houses pretty much outlast vehicles (most of the time) it would make more sense to lean towards the house wiring standard

Let's talk about RV's and trailers.........why would you want to run into a 120/ 240 circuit, not realizing that "the rest of the rig" uses black for the 12V ground? That might be an "enLIGHTening" experience LOL