Camionero

[Satyr]

it means truck driver.

However, I was reading this article in a Buenos Aires online newspaper about children that prostitute in order to buy paco (its like crack).

En Pompeya hay chicas que se prostituyen a los 11 años para comprar paco. Sus clientes suelen ser camioneros, que les dan 5 pesos. La Policía está en la mira. Y la Justicia, sin recursos, no responde.

...
Lo que hará ahí adentro ya se sabe: aprovechará los cinco pesos que le dio el camionero a cambio de un rato de sexo y comprará una bolsita de paco, con la que se alejará del mundo durante un par de horas.
...
Desesperadas por paco, van a la avenida Amancio Alcorta y encuentran a algún camionero que las levanta, se las lleva a dar una vuelta y les da cinco o, con suerte, diez pesos.

They use the word camionero in what seems to be a different way. It seems to mean "someone who solicits a prostitute" or a John. Is my assumption correct? And has anyone heard this usage before?

[Tomisimo]

I've always seen camionero as truck driver. Maybe they are just characterizing truck drivers as the typical customer.

[sosia]

Agree. The typical customer is a truck driver. They are minors, so a "normal" customer can be traced. Truck drivers are more difficult to find. And truck drivers have the "bed" int the truck, so the don't need an hotel.

But I'm not an Argentinian expert.
Saludos