"Many people add one to the passenger front door. "

For those contemplating this, beware that you won't be able to open
the glove box without first opening the passenger door. Bus Depot has
some plastic frames with heavy duty stretch netting that make a more
open pocket. They are intended for use in campers, at least that's
where I use mine. But they would like perfectly flat on a door panel
while still being of use to the passenger when needed.

Jim