Replacement components and accessories for ladders repair and improve ladder operation. Warning and rating labels display instructions, warnings, duty ratings, and other messages. Safety gates and cages help prevent unauthorized use and increase safety. Rungs, steps, and rung locks improve ladder stability and safety. Platforms support personnel while standing at the top of rolling and cantilever ladders. Planks for ladders are flat surfaces for workers to stand on while performing elevated tasks. Shelves, trays, and containers connect with ladders to hold and store work items. Carts and storage protect and hold ladders during transport or storage. Stabilizers keep leaning ladders stable while elevated. Feet, casters, and leg levelers mobilize or stabilize ladders. Jacks install onto extension ladders to secure planks. Rope and pulley kits extend and retract extension ladders. Trestle brackets convert extension ladders into trestles to support scaffolding.