Repairability isn't one of the top design requirements. The previous postal truck was the Grumman LLV (https://en.wikipedia.org/wiki/Grumman_LLV https://en.wiki

Repairability isn't one of the top design requirements. The previous postal truck was the Grumman LLV (https://en.wikipedia.org/wiki/Grumman_LLV https://en.wikipedia.org/wiki/Grumman_LLV). Check out this article on the design requirements and testing procedures: https://postalmuseum.si.edu/collections/object-spotlight/long-life-vehicle https://postalmuseum.si.edu/collections/object-spotlight/lon... Because it was for (non-military) government use, it naturally sucked. No air con (but you got a tiny fan!), a dinky heater that didn't really help, the chassis of a Chevy S-10, a 3-speed auto, and the engine from a Fiero. But the parts were easy to source and cheap.