Parking is one down side to a bus or airport van,the width of each, but to have that extra inside space would be nice and where are you setting up at? Just make sure that you have inside height to clear your head with. Also think of how your serving window is to the customer and how hard it’s going to be installing one in a vehicle. Not so hard in the bus but the airport van might be a little hard to install window. Just think of how tall you are. Mike