I wouldn't say that I'm overly concerned--just want to make sure I'm not doing something obviously stupid to more seasoned MX travelers. Like leaving a cell phone on your truck's front seat while shore diving in Bonaire.Are you worried the driver will take off with your stuff? I wouldn't worry about that but you should always make a note of the taxi/van number, maybe take a pic before you get in. This could be important in case you leave something behind.