If your interest is in wargaming, the Italians had numerous trucks, both light and heavy, with incomplete info on most. However, heavy trucks were rare. The light trucks could generally carry 12 troops in back plus one sitting beside the driver. However, this was not the primary purpose of the truck. They had to meet certain distance requirements in order to act as supply trucks (Their primary duty). The standard range was 200 miles US with a 10% fuel reserve (220 miles total). This was intended so that they could start from a supply dump with a full tank of petrol, reach a division 100 miles away, unload, and return to the supply dump for another load of supplies and fill up on petrol. It could then make another trip, etc.
Off road (cross country) speed was pretty low, only about 12 miles per day against opposition. This doubled to 24 miles on a dirt road and doubled again to 48 miles on a paved road. With no opposition, double all figures. This is wargaming info only.