Was headed home with a load of wood tonight and felt the load shift. Looked on the right side mirror and saw sparks. Got it off the road and it looked like the wheel was still attached to the hub but the whole hub assembly had come off the bearing. The bearing looked to also have moved out. The axle looked fine and the bearing surface did not appear to have been damaged. I've looked at the diagrams of the axles but it isn't obvious to me what happened. Does this sound like I need to replace the hub assembly or replace the whole axle assembly? It is a 6 bolt 5200 axle with electric brakes.