I had a 600 Berlingo (same van as partner) put a 250lt and a 125lt in there, when I filled it up it was like preparing for take off, nose up in the air

You've only got 600kg total carring capacity, including yourself, fuels, oils, hosereel, poles, etc etc, with a 400ltr filled you'll almose certainly be overweight, unless you only weigh 6 stones
