Hi admin,Tim can make these to order,your choice standard or bigger obviously space dictates.One idea I had was to put the fuel tank where the water tank is as the water tank is bigger,makes for a more sensible size fuel tank,this can be made slightly bigger approx 3" deeper(from side of van inwards)I have now looked at different vans & the tanks have been different on quite a few!so you would need to speak to Tim further if you are interested in a stainless one, a photo of tank might help.