We will be in the Novotel carpark at Carpex. Doubt if we'll be able to do a full demo, however peolple can have a look and try and understand it. Will hopefully have both 13hp and 15hp there. The 15hp is not ready for sale yet as it has been built to our spec and is still undergoing trials. We have tested the 13hp for nearly 2 years and are now confident to sell them.
Authur
Like all van mounted systems it is not the physical dimensions of the machine that are the limiting factor. What you have to allow for is the additional capacity, both weight and size, required to carry fresh water and enough hose to carry out your work. Water weighs 1 kilo per litre and I believe you need a minimum of 200 litres onboard, preferably 350-400.
Coupled to this your hoses/reel. You do obtain some space saving with the Prowler as you don't need a waste tank.
I would rule out small vans such as Escorts, Couriers etc. However you can get away with using a midi size like the Expert, provided it has the carrying capacity. ps you can always work off a hose pipe.
Personally I believe vans are like sheds, never big enough and you always wish you'd bought a bigger one.