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Guide to Type IAA Heavy-Duty Ladders for Industrial Use Type IAA ladders are the highest ANSI duty rating for portable ladders, supporting up to 375 pounds versus 300 pounds for Type IA. They feature thicker rails, wider steps, and stronger rivets for maximum safety margins. At Dallas Ladder in Rowlett, TX, we stock Louisville Type IAA ladders for industrial professionals. Our Type IAA Selection The Louisville Type IAA HD Twin Stepladder offers a 50% larger platform and 36-inch handrail. The Lo …