Shepherd 12 in. Steel Tri-Dolly with 300 lb. Load Rating 9442 - The Home Depot
Richelieu Hardware 6-7/16 in. (164 mm) Three-Wheel Dolly with 200 lbs. Load Rating F29317 - The Home Depot
Sports Parts 3 Piece Big Wheel Dolly SC-12167 | eBay
Amazon.com: Mount-It! Stair Climbing Dolly - 3 Wheel Stair Climbing Cart | Easily Lift Heavy Items Up and Down Steps | Holds 330 Pounds and Smoothly Rolls on Variety of Surfaces -
Amazon.com: Tri Wheel Cup Dolly with 3" Hard Rubber Wheels - 840 lbs Capcity - Made in USA : Industrial & Scientific