I spent ~5 years working as a diesel tech for a small ambulance/medical transportation outfit - at the time they had ~8 ambulances and 6 or 7 other vehicles for us two mechanics to enjoy.
Personally, I think it was a great job... BUT - it was a
small privately owned outfit AND my Dad/I were good friends for many years with the owner.
I had very flexible hours (work as much or as little as I wanted, come/go as I please - perfect for a college guy!) and the pay was good for a spry young buck. Working for a smaller place, you can get to be a "Jack of all Trades" - one week I'd be setting up a computer network, the next week I'd be changing oil in the boss' backhoe... I liked that - a LOT.
About the only thing I had trouble with was arguing with said owner over how some stuff should be fixed... and/or the scheduled maintenance intervals. In the end, I basically shrugged it off and did what I thought was right (better maintenance... ). It also helped that I had one of the best coworkers a guy could ask for - he's still a very good friend of mine.
You'll have a LOT of crisis issues to deal with that must be taken care of ASAP - and you'll also find that when a rig comes in just for an oil change - you'll spend all day working on it... doing brakes... changing light bulbs... nit picky BS. Some rigs are out so much that if you don't do all this stuff when you can, you won't see them again for 10,000mi.
The electronics in these things are really, REALLY simple... there's just a LOT of it and the aftermarket companies taking Ford chassis and slapping ambulance bodies on them are not employing the world's best engineers.
I was also required by this outfit to be first aid and CPR (health care provider leve... ) certified... as well as receiving a full physical and round of preventative shots... all paid for by the employer, of course. They did this in case I was needed to do a medical transport run (which I did on occasion... )... or if there were ever a big disaster and an MCI (Multiple Casualty Incident) was declared - I could drive the ambulances and let the EMT's/Medics work on the patients. This only happened once or twice, though.
One big bit of advice I'd offer is that if you do decide to work for anyone servicing emergency vehicles - make sure it's very close to a decent hardware store with lots of stainless fasteners... you'll be visiting OFTEN.
Beers,
Matt