Trucks, like other vehicles, have been anthropomorphized. The Anthropomorphic Uhaul has drawn ire. On Sodor, Elizabeth the Vintage Lorry was already old stock. Trucks of course were major rivals to trains, so Thomas and Friends' prejudices are understandable.
To be clear, the anthropomorphic vehicle is not always goodness and light, e.g. Maximum Overdrive. There is an entire genre of horror movies about possessed vehicles, including: "Car, Maximum Overdrive, Duel, Christine, Black Cadillac and Blood Car to name just a few."
One should also see: The Taco Truck Anthropomorphic