 Wentworth, New South Wales was Randell's base for two decades until the 1870s, as he supervised the expansion of his fleet and the burgeoning of trade on the Murray-Darling.Randell built a residence "Bleak House", a floating dock, wharf and warehouse at Mannum.At its peak around 1860, there would be 20,000 bales of wool unloaded at Mannum and driven by horse teams to Port Adelaide.