Rock-N-Roller R16RT Max Wide 8-in-1 Equipment Multi-CartThe R16 Ground Glider instantly transforms into any of 8 configurations. Super wide R Trac 6x3 front casters with brakes and 8x3 rear wheels easily roll heavy loads over grass, dirt, and soft carpet. The custom designed R Trac Wide wheels feature low profile no flat tires, lightweight but strong polymer hubs, low rolling resistance, pneumatic like cushioning, vastly wider load dispersion over soft terrain, and look like racing wheels. 6x3 brake