Get a bigger tank than 250 ltr Tom.
Minimum of 350 ltr for a one man set-up but 400 ltr woud be better otherwise you will soon be found lacking.
ive a seat inca van so payload does not allow for now
250L will do until i establish myself a bit more , thanks andy
Fair enough.
Maybe consider just getting a price for a company to fit the tank if you want to save money and don't want to do it yourself.
You will be able to fit the rest yourself easily enough.
ps. the system you have linked to looks ok, but pole doesn't look great.
Consider the properties you will be cleaning, I would recommend a minimum 22ft pole.