Parts of El Salvador, the driver always stays with the truck. Or at least someone who can move it while your in the cities and towns.
Rural areas are not too bad but none the less, you keep it in a gated area or next to your window/door.
Not having it too shiny also, helps.
Also, at least what I have heard, is never leave anything of value in plain sight or near windows... Watches, shoes etc. I've heard stories where they break a window to take a pair of shoes while they are taking a bathroom break at a gas station. Again, This is mostly in big towns and cities...
Will keep you in our prayers...