That is a nice system.
The stainless box, is that the oil/water separator? Does it have pumpout and polishing filter capability to re-use the water?
Looks like you might have primary drums and secondary drums, primaries on the ground and secondary on the trailer with pump-out going to either polishing filters to re-use the water or to pump to the grass or sanitary sewer.
That is a nice Sutorbuilt blower system, looks like maybe you could even run 300' of vacuum hose for each surface cleaner or vacuberm or vacuboom.
Very professionally made.
Are those level sensors on the sides of the drums to kill the blower if the water level gets too high?
What brand are those surface cleaners? Mosmatic?