Vantech Aluminum H3 Rack 2 Bar System for a Chevy Express 1996-On 2 Bar maximum weight capacity is 500 lbs. evenly distributed. Heavy Duty 3" X 1.5" aluminum reinforced cross bar (A286) 10 gauge steel clamps directly onto gutter rails for drill free installation. Lightweight @ 12lbs 1 bar / 24lbs 2 bar / 36lbs 3 bar Minimal wind noise from oblong shaped cross bars