What are Ladder Duty Ratings and Ladder Load Capacities? - Sunset Ladder & Scaffold Blog
EN131 - Changes to Ladder Standards - The Ladder Association
iYofe Step Ladder 4 Steps, Folding Ladder with Wide Anti-Slip Pedal, Retractable Handgrip for for Home Office Kitchen, Black Aluminum Portable Step Ladder with 300 lbs Load Capacity - Walmart.com