Truck models can hold a single object of key value pairs, or an array of objects with key value pairs. Truck views feed on models. When rendering their templates, the views do not care what the data is. They take a model of an object and render one occurrence of the template. But if you provide the same view with a model holding an array of objects, that same view will render its template repeatedly, consuming all the objects in the model's array.
Perhaps the part we like the most about models is the fact that they hide your data. A model is an encapsulation where your data is not accessible except through the model's interface. This protects your data from unintentional modification. You can even query a model to find out when was the last time it was modified. You are not going to be able to do that with a POJO.