Yep, they have pumps on board...generally plumbed in, some may carry a portable pump as well, although I am not sure. A pump is not listed on the Promo website, as there is an assumption that if it carries water, it has a pump to move it!!
Some (all?) carry a portable dam as well.....
Just checked up the other details I have - the Lucindale Group tanker is 12,500 Litres (Does that make it BW125 or BW12.5? )
Pip