Thanks for the replies, my tanks fill up and overflow when i'm connected to mains water. Told the Jayco dealer and they replied "Not another one", but it sounded like an easy fix. Other than that the van tows really well, better than my previous Jayco Discovery Poptop. I'm also impressed with the economy from my Isuzu MU-X when towing. 11.06l/100km from Freeling to Mildura approx 350km and the return trip with a head wind was 13-6l/100km.