The pros to team driving are easy: more money, companionship, help on getting the work done, two heads to work on a problem [or look for errors or alternate ideas] vs just one.
The cons are more potential for conflict [one wants to go home, the other doesn't, one is a worker, the other a slacker, one is a neat freak, the other a slob, etc] and after awhile, it drives most unrelated [married] teams apart.
Living and working together 24/7 in the space of a truck takes the commitment of marriage for most folks - the best intentions to stick together get worn away sooner [most teams] or later [a few truly dedicated & compatible souls].