Wow, that's some great info! I'd love to see the Southland layout!
I wonder if Brainerd Cleaners has any photos of those busses?
I'd never do an Al Miller bus. The SOB (RIP) threatened a lawsuit against Hamilton County Schools because band directors were using and recommending specific music dealers that weren't his. As a result, we couldn't have dealers make calls to the school or help us with tryouts, etc. I had the other music dealer's name written down, but can't find it now. I'll just ask around again like I did last time.
As to fire truck stuff, I probably wouldn't go much farther than lights, siren, and logos. There's stuff on eBay and JC Whitney. My big question is how legal is it to drive around looking like a fire truck? Might have to cover the lights or something.