I have a Robojet 30LPM petrol engine that I do not use. I bought it with next to no use and it has had probably two days work with me.
It is a nice compact unit, clean, in very good condition, two hose reels but no drain jetting hose.
This is not expensive (the drain jetting hose) and it sits nicely within your budget.
It will split to a two man operator very easily and has been in my unit for about six years. Good kohler engine and no known faults.
It has the 400 litre tank but I could throw in a 1000 litre IBC and set it up for you.
I want £1200.00 for it
Rob