So it looks like this picture is sideways and the gouge is out of the top of the sleeve the torsion bar slides into. I would guess that somebody or something ran into it when the bars were not in or something such as a rock became jammed in between the bar and that sleeve and cause it when going over a bump. Are the bars in perfect shape? I would be contacting Equalizer about that immediately.
2008 Toyota Tundra Crewmax Limited w/tow mirrors, 5.7L, 4.30 gears, six speed tranny, towing package, Firestone Ride Rite airbags.
2014 Rockwood Roo 233s, PI HW30-C, Equalizer 10k 4 way hitch,