I agree Dave, If you are willing to try and work on them you should be able to, but read the fine print sometimes if you attempt repairs it can void the warranty, I learned the hard way. I wonder if they still even sell Chilton's auto manuals, I used to buy one for whatever vehicle I currently owned, although I am not sure if you could get one for a firetruck. Yes, where have the times went when we could work on most vehicles, spark plugs, carburetors, distributor caps.
Mark