What NFL team has had the best running backs?

My vote would have to go to the Browns, but why didn't you put Cowboys as a choice? Emmit Smith and Tony Dorsett have the most combined rushing yards from two backs that played for the same team. They also had Herschal Walker when he was good, Dwayne Thomas(Guy before Dorsett) and if your gonna coutn fullbacks, then Moose Johnston. Also, Miami needs to be considered with Csonka, Morris, Kick, Williams, and Brown.