I have a 2016 Citroen C3. I am researching towbars. Decided on fixed swan-neck but now I need to decide between Universal or Dedicated electrics. Does this confusion ever end??!! Some say you must have dedicated , some say no you don't need it (about extra £200 for it). I know dedicated is wired into your car's computer and presumably can tell you stuff that universal doesn't?? What do I get from dedicated electrics that I don't get from Universal? HELP!!