The 5 speed is a necessity for the times when you party all night and, kill the batteries.
Tell all the drunks; no more beer until you pushstart the bus.
I had to do this with the London double decker buses that
Top Deck Travel was using for tours in America. You couldn't really jump them.. If you look at these pictures, the bus is apart in 1/2 of them.
https://www.youtube.com/watch?v=vxTwL1-UFPk