That hilariously restrictive definition would have classified my old beast of an ex-military cargo vehicle as a "minivan", but I doubt you'd convince any onlooker to label a vehicle like this as anything other than a "truck":
Yeah - technically. But this whole discussion is about the consumer space, not about those purchasing commercial equipment for hauling tonnage or whatnot.
Even so, though - there are plenty of consumer pickup models which are used commercially, and more than a few can handle some pretty big loads (especially towing)...
It also has a recommended cargo weight of 6,000 pounds, so it can haul a ton (literally! and two more!) of shit.
This is really no less of a truck than a Ford Bronco or Dodge Ramcharger.