I just installed a Curt class 1 tow bar on my C-HR myself. There are no ground clearance issues at all. Even over speed bumps. I've had some discussions about this situation as to why North America has different messaging than European/overseas markets. Here in North America, towing of any sort is not recommended in the manual. But in Europe/overseas, their manuals state towing up to 1500lbs is acceptable. I also seem to recall some discussion on another forum where Toyota dealerships in Europe were installing Toyota sanctioned tow bars and accessories. I tried to locate it, but can't seem to find it now.
I've been told by eTrailer installation of a class 1 tow bar in keeping to the max load of 2000lbs for towing and 200lbs for tongue weight will not put any extra strain on the drive train or the chassis.
I installed mine more for a bike rack. But might see myself using the car to tow a motorcycle on a trailer.
2019 Toyota C-HR LE Silver Knockout Metallic
2013 BMW 135i Carbon Black
2009 Ducati 848 Pearl White/Black
2004 Kawasaki Ninja ZX-10R Black