Factory installed hitch almost failed. after 16,000 miles of towing a 21 foot travel trailer, the hitch appeared to have excessive movement. when inspected by a mechanic in branson missouri, it was found that 2 of 4 nuts had fallen off and the remaining 2 were significantly loose. had they fallen off too, a catastrophic failure would have occurred, with the hitch falling off, along with the rear bumper and a portion of the exhaust system. the trailer could have dropped off at highway speeds, causing a serious accident. please consider a recall to force an inspection of all factory installed hitches on volvo xc70, year 2015.5.