Caster for Uline Rolling Ladder - 4 x 1 1/8", Swivel H-844-SWIVEL - Uline
Werner 12 ft. Reach Fiberglass Platform Twin Step Ladder with Casters 300 lb. Load Capacity Type IA Duty Rating PT7406-4C - The Home Depot
22 FT Aluminum 5 Step Ladders,Multi-Position Ladder with Wheels,Type 1A,Adjustable Telescopic Extension Ladder for Home Roof,300 Lbs Weight Rating - Amazon.com
18FT Telescoping A Frame Ladder Portable Aluminum Extension Ladder Collapsiable to 38" w. Stabilizer/Wheels/Cargo Hold Adjustable Foldable 7+7 Foot Step Ladders 330lbs Capacity fit in car Trunk - Amazon.com
Vestil Aluminum 2-Step Ladder With Wheels Converts Into A Dolly - 18"L x 20"D x 35"H