OK, this one is really strange. Just wondering if any other owner has experienced this. We just returned from a big road trip, Houston to Banff, Alberta and back, over 7500 miles. We encountered this vibration 4 times, each occurance at 65 to 75 mph and only in the rain. It seems to be coming from the roof rack but could be from the sunroof or the rear wind deflector. It is a humming or strumming noise and ceases when I elevate the sunroof and also almost immediately when it stops raining. I know this sounds crazy but am hoping for some advice. One thing, on inspection I noticed that the little thumb screw on the front roof rack cross member is loose, not tight like the back one. It seems to be screwed down tight but still rotates, I guess it could be spinning (only in the rain?). Anyways, I hate to use duct tape on an $80000 SUV but I am gonna. I appreciate any advice. I did not mention this to my service rep, he already thinks I am nuts. BTW, other than this, the 570 performed flawlessly on this trip, off road, rough road and high speed interstate and got up to 20 mpg on some days. I love it.

 

bad screw probably, definately not causing the vibes. did u chk sunroof visor, maybe loose or something

 

waw
congrats on the successful trip
I did something simillar but on a smaller scale in Saudi Arabia
I travelled for a week across country for 3000 km from east to west.
It was great fun on my 2008 Lx570.