The rigs John builds are very high pressure and high volume.I tried to find some pics of a rig he built a while back that he sent me,I don't know where they are on my computer.Anyway it was on a lowboy flatbed like you pull with a big rig truck,Peterbuilt or something like that type of truck and trailer.It was powered by a 475 horsepower turbo charged Cat engine,made 40,000 psi and flowed 276 GPM.It was 300,000 bucks.A company in Africa ordered 10 of them.The pressure and volume is so great that a gun and lance will only last around 45 hours of use and its no good after that.He sells 20-30 guns a week.