A stand alone Trolley Unit which comes with:

12v caddy-style battery and charger, Shur-flo 100 psi pump, pump controller & 25/30 litre plastic container.

The principle benefit of the trolley is its mobility round high traffic sites were trip hazards need to be reduced or areas inaccessible to vans etc.

It can also be used with a DI vessel and pole as a system in-itself.