What variety of tomato is typically used in Italian, canned, peeled tomatoes?
Based on what they say on their web page they use both early and late varieties. The type of tomato therefore probably changes throughout the canning season. Since they source their produce locally (they are based in Livorno) I would guess that two of the varieties are Pisanello and Perino (the last variety is similar to Roma).

Here's an overview of the most cultivated varieties in Tuscany (in Italian).