We had one for a while.
It was built from a modular system. I will check when Craig is back who the manufaturer was.
You can literally build anything out of it for any industry.
Ours was set up to take 3 x 25l water containers along with spotters, extension cables, chemicals and measuring jugs, bonnet pads, pile brushes, wands & hoses for taking kit in and around commercial buildings.