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Type IA vs. Type IAA: Which Heavy-Duty Ladder Does Your Crew Actually Need? When you are shopping for industrial ladders at Dallas Ladder, you’ll notice two primary duty ratings: Type IA (300 lb capacity) and Type IAA (375 lb capacity). For many DFW contractors, the question is simple: Is the extra investment in a Type IAA worth it? Let’s break down the technical differences and the real-world ROI of upgrading your fleet. Feature Type IA (Extra Heavy Duty) Type IAA (Special Duty …