- Introducing Ifor Williams’ largest trailer to date. - Maximum gross weight of 21 tonnes. - Commercial axles and running gear make this trailer the most durable and robust trailer from our range. - 24’ by 8’ the StockMaster can be used as either a flat or a livestock trailer. - All over galvanised chassis and a one piece aluminium floor. - Low ramp angle (20 degrees) and low bed height.