Rock-N-Roller R10RT (Max) 8-in-1 Folding Multi-Cart/Hand Truck/Dolly/Platform Cart/34" to 52" Telescoping Frame/500 lbs. Load Capacity, Black Instantly transforms into 8 different shapes, replacing 8 different cart types Carries huge amounts of equipment yet folds small for storage R-Trak tires ride smoothly with excellent traction, like pneumatic tires without the hassle of upkeep or repair Textured, powder coated steel is durable and also reduces slippage during transport Featured in college engineering textbooks for its outstanding design