The Grumman LLV (Long Life Vehicle) is one of the most common vehicles on our roads, yet you probably didn't know its name. It's now being retired from USPS Mail Delivery duties, and this is its fascinating history. In the 1980s, the United States Postal Service sent out a detailed list of specifications for a new postal carrier vehicle. This "Long Life Vehicle" would replace myriad of other vehicles with one, simplifying maintenance, repairs, and training — and because it had a lightweight alum