A grain cart is provide having a wheel assembly with four ground wheels thatall pivot inunison. The wheel assembly can include a first side front wheel, a first siderear wheel, asecond side front wheel and a second side rear wheel. A first side steeringlink assemblycan be operatively coupled between the first side front wheel and the firstside rear wheelto cause the first side front wheel and the second side rear wheel to pivot inoppositedirections. A second side steering link can be operatively coupled between thesecondside front wheel and the second side rear wheel to cause the second side frontwheel andthe second side rear wheel to pivot in opposite directions. A unison linkageassemblyoperatively can couple the movement of the first side rear wheel and secondside rearwheel.
