Say what you will about the Grumman LLV, but every one of them you see on the road today is at least 30 years old, and some could be pushing 40. (The similar-looking Ford-Utilimaster FFV is ~25 this year.) As uncomfortable as it must be to sit in one for hours on end (I never had the privilege myself) you've got to respect their longevity. Here's hoping these new trucks make it to the 2050s and beyond.
"While the all-aluminum body of the LLV has resisted corrosion exceptionally well over the years, the main powertrain components have been replaced multiple times and now must be sourced through aftermarket manufacturing. This has significantly increased repair costs while reducing performance and reliability. In fact, the Postal Service had to contract an alternative supplier to reverse engineer and manufacture the…
Ship of Theseus notwithstanding, at that point, isn't it a new car if you're replacing the chassis?