One problem related to carrier/rack has been reported for the 2017 Mercedes Benz S550. The most recently reported issues are listed below.
In 2018 I had a cracked windshield, they told me a small rock hit my windshield, had it repaired at the m benz dealership, then in 2019, August I had the same thing happen to my windshield, they said the same thing, had ihem repair it again, September 2019 & October 2019,had a cracked windshield with an explosive sound, had it repaired, that's 3 in a row at the same dealership, they brushed me off after I complained to them, saying it was " pure bad luck" 3 in a row in Aug,sept, & oct 2019. The vehicle was in motion on surface roads & a highway too at the time of ocurence, it was a small sound followed by a explosive sound & cracks about 10" long appeared on my windshield, the dealership was totally unhelpful, spent $10,000/ repairing it, & when asked "did anybody have a similar experience , 3 months in a row" they said no. I complained to the service manager, saying the glass was defective, but to no avail, so I talked to the m benz distributor in georgia , but he was evasive too. I then wrote to the ceo in stuttgart , but they said they were too busy with other things, I explained to them that this was a safety & health hazard, they were nonchalant about it.