There was a coding option for the rear wipe when engaging reverse, didnt neccessarily make it relevant specifically to auto wipers fitted, of course last time I saw this was on an 8P so you'd have to do some research.
Personally if you're a very keen rider, then could fit a removable towbar so its hidden when not in use, which then hang the Thule on, which is what I have done to my A3 , doesnt even touch the boot lid & sturdy as Ayres Rock.