Yup, it was a pickup indeed.  Kind of a rabbit/golf style car.

Could probably only hold a few Mexicans, not the extended family
including in-laws that people often carry in pickups down there...

...not very smart, certainly not safe...one unmarked "tope" and
everyone flies out...

http://www.pauldottrip.com/puebla_pv/pages/DSCN2104.htm

>There's another photo here:
>http://www.pauldottrip.com/puerto_vallarta/pages/DSCN0828.htm
>
>What is the VW in the background? Looks like a pickup.
>