right there are a few subjects on the go about what size tank you can fit in certain vans, so I thought I would do a list with weights that explains why you have to be carefull
my Expert van has a 815kg payload
in my van I have a 400L tank = 400kg +the tank at 25kg so thats 425kg
then I have ladders 30kg, fuel 30kg, backpack full 25kg, containers 80kg poles 10kg, reel and hose 10kg, trad gear 10kg, roof rack 20kg, ply 20kg, me 60kg I am just wee, passenger hes just wee as well 60kg, misc 10kg
total 785kg all these weights are guess work but as you can see a full fuel tank would put me over the limit easily and I have probably missed a few things