It sounds like Bryan has a CDL, so he is familiar with pre-trip inspections as described in the CDL regulations. It is imperative that a thorough pre-trip inspection be performed. That is a bit difficult on a bus, but it can be done if you can find a way to get under the bus safely.
Several years ago, I wrote an article for our Eagles International Chapter Newsletter on the subject of inspecting/testing of the air brake system. I have added that article to our website articles page:
http://eaglesinternational.net/category/articles.
That article focused on testing that can be done without getting under the bus. However, it is important to check the brake stroke for each axle location. I suspect that your bus has automatic slack adjusters, but they can lock up and fail to work properly.
I am sure that you are aware that in order to release the spring brakes, you have to let the pressure build to full pressure and activate the release button and then give a full service brake application.
Be sure that the folks doing the oil change use 40 wt oil rated for two stroke engines (CF2 as I recall).
Tools will all be standard (no metric). Probably no way to carry enough tools to do much repair on the road.
Be sure to have extra fuel filters and oil.
I am assuming the engine has been started recently. If not, make sure that the rack is not bound up.
Tell us about your planned route.
Jim