Hi i am installing my first Heinzmann kit on my bike (Viking Targa) at the moment 200w front hub uk legal kit 36v 15mph , as my Daughter has taken over my wisper 905e , am thinking of putting a 500w high speed kit for offroad use on the back wheel 35mph using two Batteries and two throttles l/h and r/h to control the Different setups that way the bike should still be uk legal, as long as i can keep the Weight down, i cant see any big problems in setting this up as the systems will be seperate from each other but could work in combination, i am new to electric bikes any advise or comments wecome.