I’ve been using a Equalizer for many years. Early on I had the typical groaning. I studied the installation and discovered that when fully loaded for a trip that the bars were not 100% perpendicular with the L brackets. This resulted in the bars rubbing on a thin edge, not the full flat L bracket surface. I adjusted the L brackets to be 100% perpendicular with a carpenters square when static and the noise mysteriously went away. Now when moving at road speed the trailer will porpoise some and the bars will constantly change contact which is normal.
