have used the accessory hitch to put on Thule classic 2T bike rack. Very happy with rack. Of course backing up always gives sensor warning to stop with car sensing rack as obstruction. After installation I intermittently get the warning park assistance not available. It's not all the time but can go off several times while driving or even persist for a day or two. The warning is usually related to sensor damage but no accidents and sensors not pushed in. To confuse issue even more front sensors will sometimes work with the warning but other times will not. I have appointment two weeks out for service but wonder if others have similar issue with bike rack.