This is the 10372nd most frequent Polish word.
ciężarówek
"Ciężarówek" means "trucks" (genitive plural form) in English.
In this sentence, 'ciężarówek' is used as the genitive plural form of 'ciężarówka', indicating possession or quantity.
Na parkingu stoi dziesięć ciężarówek.
There are ten trucks in the parking lot.
Here, 'ciężarówek' functions as the genitive plural form to indicate the type or purpose of the station.
Przy autostradzie znajduje się stacja dla ciężarówek.
By the highway, there is a station for trucks.
In this context, 'ciężarówek' is again in the genitive plural form, used to describe what the noise emanates from.