In addition to what some of the other have said. Of concern to me if driving a long way back home, I would want all the gauges to work correctly. Not having an oil pressure, temp, or trans temp gauge before a long trip would be a no go for me.
Route planning would be important too. Not the time to take the road less traveled across the middle of nowhere.
I happen to know where that bus is, so I would recommend a weather check as well when you know you would go to get it. There are plenty of areas that would be bad to be in a snowstorm on the way back. PM me if want to discuss the areas I would be worried about.
I'd probably do the math on whether its cheaper to pay $50 for checked baggage or simply stop at walmart or harbor freight and pick up some hand tools, multimeter, test light etc. I'd probably grab some oil appropriate for the engine, trans, and some spare coolant as well. If are real worried after looking at it, you might see if belts or hoses are available before you are in the middle of nowhere.
In my opinion, get the bus you want. But I would consider paying a premium if you can buy it close to home. You have done the math on how much the trip out and back to get it is. I would pay MORE than that total amount to reduce the risk to be 150 miles from home rather than 2k.