L/Cpl,
The Machinery I30 vehicle was actually mounted on a 3 ton 4x4 chassis, at a guess I would say on a Bedford QL or Fordson WOT6 chassis. Its description was; "Plant, battery charging, constant potential, engine driven, 15/30 volts 200/400 amps".
The Type I30 replaced Type I, which was mounted on a 3 ton 6x4 chassis and described as "Plant, battery charging, 7.5/15 volts, Board, battery charging" which was in use at the beginning of the War and subsequntly became obsolete.
Richard