It’s a nice set up, pity he didn’t say how much it cost.
Does he really need so many chemicals?
The thing about using the truckmount engine to produce the heat is it’s not very efficient, fitting a diesel burner would be be better then you could use much more Efficient Diesel engines which run cooler, last longer, are less complicated (so are more reliable) and are cheaper to run. Not many companies build industrial equipment uses petrol engines.