Haulin mail since 1931

I spotted this third-party mail truck on my walk this evening. It was stopping to get gas.

Riddle update: He's on a couple of new medications. One will help his potassium and calcium levels, and another is an appetite stimulant. Sadly, these seem to just be to make him comfortable. He's essentially on home hospice care. He is 18 years and 8 months old, so we knew the inevitable was coming, but it's still hard to take.