Depending on the fire station... I wouldn't hesitate to use one.
I was a mechanic for the city I live in, one of my jobs was to work on and maintain the emergency equipment.
Any time a fire truck went out on a call, when it returned, I went and brought it to the public works shop and checked everything out and filled it with fuel. Then I would bring it back to the fire station, pull I into the nice 70f shop, plug in all the heaters and air. The next time the truck had to go out on a call, it was full of air and up to temp. So no cold starts ever.
A few years ago we shipped one of our older engines down to California to get it completely overhauled, paint pumps and everything else. It only had 36,000 miles on it also, the shop down there completely checked it out including putting it on their dyno. They said that it all checked out and was as good as new. So that didn't get replaced.