our water tender has a compressed foam system..(CAFS)and the foam is able to stay on vertical walls, etc. it also does confine and stop the spread of fire for flammable liquids which are spilled. It also stretches the capacity of the water so one gallon covers as much as it
used to take 10 or 100 gallons. This is great in areas where there are not hydrants, and the water has to be trucked to the site. the tanker holds 3600 gallons of water and 80 gallons of foam concentrate.

There was a manufacturer who had a small pick up truck sized unit who did a demonstration for our fire dept. when we were in the market for
this system. I will let you know if i come across the name of the company or the apparatus.