The "fridge lead" in the trailer wiring harness fell victim of a cost-cutting exercise in our organisation a few years ago. The argument was that compared to the total volume of trailers, caravans with fridges were too small a minority to warrant continuing to fit this lead across the board. In most cases, the lead was not used, so in order not to penalise the majority with unnecessary costs, the lead was deleted. Whether this was a proper decision or not is debatable, but that's how it came about.