I used to fill up in van due to keeping my 350gpd ro in van and filtered straight into tank. So topped up my 500ltr tank, due to little storage space in yard. However ive worked round that now, and to pump adequate water from static into van is less than 5mins (unless hose shoots out n floods my van again). So i usually do in morning whilst sorting kids for school.
I av a scudo 815payload but 56 plate, x council purchased last yr. But its behind was droopy with full tank. Havent spare money at mo with 3 bady due any day now! So i stuck some rubber suspension wrap around on and has helped tremendously. So dont like to carry much weight at mo. So i fill up each morning.