Teams are scored in the same general fashion as a Driver in a series, averaged by the number of team drivers.
Team Points are calculated by a total of all team member driver points divided by the number of team members in the event. This allows a 2-man team to compete against a 10-man team. However, a 1-man team is penalized by still being calculated as a 2-member team. It isn't a team with only one person, right?
Teams also get a Rank score based off the same calculations as a Driver Rank.