i have got a w reg 55. got a 250l tank in it. 1 x 12l(ish?) DI vessel, 1 x 100m micro bore, 1 x pole, 1 x surflo pump and all associated hose, 1 x box full of trad gear and on occasion carry a double extension and single piece point ladder. i work on my own so only my weight in the van. when tank is full of water the handling isnt too bad but it is well sluggish so i do have to leave a little bit more for traveling time.
hope that helps