Abstract: A mobile support device for supporting a concrete spreading hose includes a truncated V-shaped support having a horizontal web position and upwardly diverging legs. Castor wheel assemblies support the V-shaped support for travel over a surface. A hold down mechanism is pivoted to one of the legs and is engaged by a keeper element releasibly locked by a locking element on the other leg. The hold down mechanism clamps and confines a concrete spreading hose seated in the truncated V-shaped support. The concrete spreading hose is secured against movement relative to the support even when subjected to pumping surges.