2016 Acura MDX body & structure problems

Dear sir/madam - I was heading to my office from home on the highway ca-84. While driving today on the highway at around 50MPH I hear sudden loud pop up sound from the roof, I felt like an earthquake and vehicle starting to shake. As I slowed down I felt something wrong with sunroof. Since highway leads to the bridge and has no exit I continued to drive. Highway becomes internal road after 5 miles. As I got an opportunity I parked the vehicle and get above to check what really happened.

Tl* the contact owns a 2016 acura mdx. The contact stated that sidewalls of the spare tire, which was stored underneath the vehicle, was wearing through at three different locations. The cause of the failure was not determined. The manufacturer was not contacted. The failure mileage was 20,000.