i have always driven my bus' in the winter, but not as often as in the summer. Maybe just a few times per year....like santarchy, new years etc. I've found that conventional 71 passenger buses tend to do really great in the snow. 10r22.5's are like 39 inches high. Those would be monster truck tires if they were on a pickup. Hydraulic brakes are nicer than air for snow driving in my opinion. Not only do air brakes have more freezing problems, but there is a bit of a delay from the time you push/release the pedal until the brakes react...not so good when pumping the brakes while trying to stop on slippery roads. However, air brakes certainly do work in the winter. One more thing about air brakes in the snow......when you park, try to use wheel chocks instead of your parking brake. or else the shoes have a tendency to freeze to the drum. Sometimes only 1 side will break free when you put it in gear which makes your wheels on that side spin, and the wheels on the other side are froze solid.
With my diesel engines, i also like to cover most of the radiator with plastic or cardboard to help her heat up a bit. You can cover a lot, perhaps 90 percent and usually be ok.....but we don't have any big hill climbs around here. It takes so much heat out of the engine just trying to keep the inside of the bus warm that overheating isn't really much of an issue.
plugging in the 110v block heater for an hour or so before trying to start the engine is quite useful. A small propane heater under the oil pan or a torpedo heater pointed at the engine with the hood tilted forward also work for engine pre-heating.
i'm not a big fan of starting fluid...and stay away from it if you have glow plugs or a grid heater....but a single squirt of about half a second is enough to get things going, especially if you are in the middle of nowhere and dont' have access to electricity or another way to start your bus should your batt's get low.
if using the jacuzzi in the winter, i also need a full time squeegy guy to keep the condensation off of my windows.
I'd love to have a heated floor in a bus...like in floor radiant heating, along with the standard heating system....someday i think i'll tackle that one.