In fact, the Postal Service had to contract an alternative supplier to reverse engineer and manufacture the chassis frame to keep the LLV operational. As a result, the average annual maintenance cost exceeds $5,000, with 7% of LLVs exceeding $10,000 annually. Additionally, they are less fuel-efficient and unsuitable for future delivery needs given projected changes in market demand, mail mix, and increasing delivery points.
The LLVs also lack modern safety features such as airbags, anti-lock brakes, air conditioning, back-up cameras, blind-spot warning systems, daytime running lights, and seatbelt reminders." https://uspsngdveis.com/documents/USPS+NGDV+FEIS_Dec+2021.pd...
Sort of a Ship of Theseus vehicle. Yes, some have lasted over 40 years, but that's with potentially multiple drivetrain replacements, at an annual maintenance cost of $5,000 - $10,000. That feels high, given how simple those vehicles are.