He may have meant "small truck" instead of light truck? "light truck" has a specific definition and it's probably not what most people would think when using or hearing the term. A Prius is about the same weight as a lot of small trucks, or at least what small trucks used to be before the weird side-effects of fuel-efficiency regulations:

  2005 Tacoma: 3,140 to 4,4100 lbs
  2005 Ranger: 3,028 to 3,606 lbs
  2003 S-10: 3,016 to 4,039 lbs