I would say that the main thing is to be proactive, and to be looking ahead much more than most people do; they teach that kind of thing in motorcycle safety courses, but it's just as applicable to driving something large, heavy, and with air-brakes.
Most people only look a few car lengths ahead, which is usually about where the vehicle will be in a second or two. You should take all of that information, and keep it in the short-term memory, and focus more on where the bus will be in 3-5 seconds--you can still absorb all of the shorter-term information through your peripheral vision, but you have a better understanding of why... And the height from the driver's seat is great for this, as you can usually see over several cars at once. When you see someone brake a few cars ahead of you, you can let off the gas, and cover the brake pedal just in case you need to slow down or stop.
The other thing I would advise, that generally isn't a problem outside of big cities with hyper-aggressive drivers is to keep more space between you and whoever you're following. On the highways, this is generally pretty easy, and you'll have no problems, but in the cities, you'll frequently have assholes cut you off, and you just need to let off the gas and let them have it. Everyone knows that a bus will win that argument, but it generally just becomes an expensive pain in the ass that takes far more time and money than it's generally worth.
The only other thing that is really worth mentioning is that you will always have to turn wide, but that is mostly just a "feel" thing, as every chassis has it's own feel to it, and it's one of those things that's like making a bike turn at high speed... It's weird at first, but then you get used to it, and don't even think about it. Just remember your angles, and how slow and wide your ass is, and everything else should fall into line.
