if you want the auto retracting ones then you will pay through the nose for the wiring for it and retrofitting it is a bugger. i would recomend that you get a "detachable flange" towbar that way a bike carrier can virtually be bolted to the tow bar "thull" do a good cycle carrier.
as for the electrics there are two options
option 1
you can get the expensive wiring "cambus" with will tell the parking sensors to turn off and it will alter your stabillity program to compensate for the carrier or trailer
option 2
you can get a 7 way universal bypass unit from ebay for 15 quid and wire it up yourself. downside to doing this is that the parking sensors will go nuts when you put her in reverse.
if you go downthe towbar route its verry simple to fit. NOTE you take the bumper bar off and fit the towbar and then replace the bumper bar over the top so no crumple zones are missing. hope this helps
owen
