i have one of these systems 650ltr had no problems
  
with it and would highly recommend excel systems 
 and andrew is very helpful . i have a transit 3500kg lwb
 as i do pressure washing and have a further 600 ltr tank
 hot machine gen and pressure washer on van
 but only fill one tank to travel
 andrew iam still waiting for the float valve
 but got the other
    robin