Hi i have got a humming noise comming from the rear passenger side of the car at speed and think it is the bearing can anyone give me some tips on the grease that should be in the brearing and if it is worth going for a water proof one or not. I have heard of this bearing being noisey from other owners that tow with the same car. could it be that the bearing needs to be cleaned and inspected re packed with grease ? Any help would be appreciated