Basically you'd lose right at 2 inches of ground clearance at the center of the rear bumper of your 2019 Audi A4 Allroad when the lower ball mount portion of the Stealth hitch part # 391AUDA417T.
I can't get you an exact figure since we haven't had chance to install this but if you check out the picture I attached you can see what I mean. Also, when the ball mount is removed you'd have no loss of ground clearance at all. view full answer...