For those of you who are driving on the limit, dont forget you are still at risk of having one axle over the limit, the weights given for overall weight assume that your load is even over the full length of your van, to be safe allow 15% for uneven weight distribution.
If you have a 600 tank it will be about 650kilos full allowing for the weight of the tank itself.
Filter system including pumps etc 50kg ?
hose reals 20kg times 2 = 40kg ?
ladders 40kg ? ?
2 people 150kg
misc squeegies , buckets , 50kg ?
ply lining 100kg
4 poles 20kg
fuel 80 kg full tank 80 litres
see you are already up to 1180kg allowing 15 % for the unseen (uneven loading, extra passenger etc)
you will need a payload of 1360kg assuming the above weights are true