The last berlingo we kitted out had a 400ltr tank, pump, varistream, 110Ah battery, tank cage, 11ltr di vessel, 12ft extender pole, 25ft eco-lite glass fibre, 35ft eco-lite carbon fibre, metal hosereel with 50m minibore and a full set of handtools. Took it the weighbridge at the farming supply yard, with a full tank of water and all equipment it only weighed 432kg more than the empty van (weighed it before fitting the van out, only about a mile to workshop from weighbridge so very little fuel used).
Can't imagine a trolley would be that heavy?? Why not go for a backpack instead??