ive had 2 towbars fitted on new audi's. 1st was fitted by towcraft and was exactly what i specified,detatchable westfalia and all electrics functioned perfectly.they had used a plug and play wiring kit.this disengaged the fog lamp & reverse sensors when hooked up.when i replaced this car i specified an identical towbar and wiring.they sent it to the local sunroof centre,hacked into the wiring and fitted a fixed witter bar.I was towing that weekend so i took the car.crap job,lights didnt work,esp on car inop,rev sensors working all the while. took some time to convince the dealer to replace the cut boot wiring,remove towbar and take it to towcraft to fit a bar.they are an excellent company to deal with.pay the extra and have total peace of mind.Ive send many people thereand i own my own garage,ican't buy all the bits for what they fit them for.