Changes:
-Resized to 1:1 scale
-Raised the suspension a bit
-Slightly modified the mirrors
-USPS logo is based on the tail logo from my USPS 727

The Grumman Long Life Vehicle (LLV) is an American light transport truck model, designed as a mail truck for the United States Postal Service, which has been its primary user since it first entered service in 1987, 37 years ago. It also was used by Canada Post. The LLV uses a chassis built by GM based on the S-10 with an aluminum body built by Grumman.
In the United States, the Grumman LLV is the most common vehicle used by letter carriers for curbside and residential delivery of mail, replacing the previous standard letter-carrier vehicle, the Jeep DJ-5. Curbside delivery from a driver seated in a vehicle to a curbside mailbox is sometimes termed "mounted delivery", in contrast to walking delivery.

The USPS purchased more than 100,000 of these vehicles, the last one in 1994. As its name suggests, the Grumman LLV is easily capable of a long life. The required lifespan specified by the U.S. Postal Service was 24 years, but in 2009 this was extended to 30 years. The Grumman LLV can easily last over 200,000 miles on its original engine and transmission before needing an overhaul.
In 2010, approximately 140,000 LLVs remained in the USPS delivery fleet; retirement and attrition had reduced that to 126,000 by 2021. A number of these were also sold to Canada, operated by Canada Post.

Controls:
AG1: Headlights
AG2: Left blinker
AG3: Right blinker
AG4: Open gas cap

Credits to @TheIntruderReal for the Grumman LLV