You shouldnt be seeing any chunking from the Trailair (provided you dont have a air ride 5th wheel hitch like the ET or similiar.)...
i got a solid mounted 4 way hitch on my volvo and the Trail-Air (came from the factory that way, granted my trail-air was made
before they got bought up in 2007ish) on my 5er and it rides beautiful. got a camera that looks right at it so i can see it whats going on going
down the road.
i got over 30k miles with my setup and ive left things in my bedroom on the counter (by accident) in the 5er that might have broke with the roads
in Utah, Wyoming on I-80 and they never moved a inch.