I'm currently working on an ambulance. College is in full throttle, so I have no idea when I could complete it, but it's on the way.
As for mail truck, that seems simple enough... I am the son of a letter carrier. Yes, I that's something I would do. That's a nice, small, friendly sort of vehicle to add detail to the city. A small project between more complicated ones.
Ambulance, mail truck. They're on the way.