even though the OP isbt going to get this bus.. this brings up a valid point for Anyone looking to buy a classic bus..
Get in contact with Bus collector groups.. (yes we exist.. some convert, most keep them as busses) most are more than willing to help answer questions.. and chances are someone in said group has a bus similar to the one you are looking for..
for a bus like this one, the BusBoys is a good group.. there are many kinds of busses in that group.. some converted some not..
also anyone who is going to traverse the country in a classlic like this needs to have or learn some mechanical skills.. sure if you get a flat a mobile truck will change it.. but what if a belt flies off and shreds.. guaranteed that no auto parts store can look up the belt for you.. its up to you ahead of time to take note of the numbers on them.. or take them off and measure them..
blow an air line? would you have any idea on how to fix it? clutch linkage fall apart?
classic busses are an awesome way to travel the country and a piece of history like a classic car.. but anyone who has one will tell you to keep a fat wallet inside your fat tool chest aboard the bus.