Many truckers out there prefer to drive their rig alone, but others enjoy having a friend or their spouse to be on the road with. The idea behind team truck drivers is to get deliveries made faster. The truck is able to go further in a 24 hour period because you have two drivers that can drive. They can each drive all of their hours of service and then switch or drive in timed shifts.
Most team truck drivers decide to drive in full shifts so that the other person can get sufficient rest. Basically, the team will stop at regular intervals so each can eat, shower, and use the bathroom. Each person that makes up the team has to keep their own log book of their hours of service, both on duty and off duty.