Hi
Ds there is a company here in Manchester who will build you a hot box for around 500-600, the system can be built on a frame and bolted to the floor of your van, probably half the size of the one shown in the pic, fuel pumped directly from a 25litre drum.
I have a lavor vulcano- i had no problems for 12 months then needed new transformer , fuel pump and electrodes
Hot box cost just over a bag of sand- grand
The guys at taybur took care of my machine and i have seen the systems they build , wish i had spent my money on there system.
System run off generator bolted into my van
Regards
Billy