After a few years and MANY requests, I started a build line of 4 blocks wide about 1.5:1 scale vehicles. I'm still building 5 blocks wide about 2:1 scale. I'll post the scale in the title and block count in the description. But you need to pay attention to the post, Make sure your downloading the correct scale build.

The United States Postal Service (USPS; also known as the Post Office, U.S. Mail, or Postal Service) is an independent agency of the executive branch of the United States Federal government responsible for providing postal service in the United States, including its insular areas and associated states.
The USPS as of 2017 has 644,124 active employees and operated 211,264 vehicles. The USPS is the operator of the largest civilian vehicle fleet in the world. The USPS is legally obligated to serve all Americans, regardless of geography, at uniform price and quality. The USPS has exclusive access to letter boxes marked "U.S. Mail" and personal letterboxes in the United States, but now has to compete against private package delivery services, such as United Parcel Service and FedEx.

Minecraft 1.13.2 - BPS 1.5 HD pack

https://sites.google.com/view/blueprintmc/resource-pack

Remember this is a Smaller 4 blocks wide, 1.5:1 scale vehicle.