Sandmover 
A make of tractor mounted drop spread top-dresser: There are 2 models, with an optional, hydraulically adjustable conveyor belt for sideways depositing of sand into excavated drainage trenches:
Sandmover
A make of tractor mounted drop spread top-dresser: There are 2 models, with an optional, hydraulically adjustable conveyor belt for sideways depositing of sand into excavated drainage trenches: