W140 S600's dads car doesn't ride hard even with low profile tires on 18in wheels! It isn't a super cloud like, like American cars like a Caddy or Lincoln but it is a very soft riding car.

As for the wind noise their should be no wind noise.

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2006 CL500
2009 C300 4matic
1969 280SE
2023 Ram 1500
2007 Tiara 3200