This may be of interest to anyone thinking of upgrading to a 3 vac machine or even to a affordable new truck mount, or indeed anyone who has not seen a portable van mounted, or the Prowler..
The 2 videos are on you tube, both are American.
The Scorpion is from a guy who put his video on another forum. The Scorpion is a 3 vac system but interestingly this guy has a inline single vac booster (just outside the front door) making this a 4 vac system with the main unit in his "truck". He has a generator but most over here run heavy duty extension cables from the house to the van. He also has an inline heater (again just outside the door. He says the machine has done 4000 hours and still on original vac motors -impressive.
http://www.youtube.com/watch?v=OdsFf1ifjPo&feature=player_embeddedThe 2nd video is of the 13hp Prowler. The video shows the builder of the Prowler (I think). He takes you thro the machine nicely, and uses 150 ft of hose just to show how effective the machine is (he obviously could have used less at that house). There is a part 2 to this you tube video.
http://www.youtube.com/watch?v=QprMO7JPY8A&feature=relatedI hope you find these helpful. I personally think they are 2 very good you tube videos.