BACKRACK Side Rails Standard; 8.2 Ft. Bed; 19-24 Chevy Silverado/GMC Sierra Model 80524BACKRACK Side Rails Standard; 8. 2 Ft. Bed; 19 24 Chevy Silverado GMC Sierra Model 80524 SERIOUS STRENGTH: We get it. You do not want Siderails that try to look tough but have no purpose. BACKRACK(TM) Siderails are industrial grade and designed for trucks that push the envelope of on the job abuse. Heavy gauge HRPO tube is fully welded to an angular base that runs the full length of your truck bed. We expect you to overload your truck. BACKRACK(TM)