So I just bought a Nissan Titan and in the back are 255/75/17 BFG Mud tires and on the front are all-season 245/75/17 (which are shot). Not sure whay they had 2 different sizes but I was told that is bad and I need the same tires up front. If I put 255's(not mud tires) up front should I not have a problem as long as they are the same size front-to-back or should I ditch the mud tires? They are in pretty good shape.