I run my machine directly from the van, never had security problems. I have a 250ltr auxiliary solution tank fitted with a hoselock connector so no filling problems. The tank is also fitted with an emersion heater which I run for about an hour on cold mornings to take the nip off, this helps the inline heater to keep up to heat.
I have 150’ of solution and suction hose on a reel, though usually 50/75’ is enough, very rarely would I use more than 100’.
I find working from the van much easier, so much so, that on occasion I’ve turned work away if access is a problem.
It also allows for those with far less scruples than I, to tell the client that the machine is van mounted because it’s far more powerful than the machines that other carpet cleaners use and therefore will produce a far superior clean.