To transport my .002 horsepower personal transportation device (see below) on my former W124, I used a Yakima roof rack system with absolutely no problem. I now use the same system (slightly modified) on my E34, also with no issues.

From time to time, there is a child's car seat strapped to the rear bench of both the TE and the 525i. My experience is the same as a prior poster's - my seats snap back into shape soon after the munchkin seat is removed. Can't say the same for my senses, but that's another story.

I have found also that the interior materials in the W124 (and the E34) are remarkable in their ability to shed ditritous left behind by my young friend or my own offspring. My daughter left a crayon on the driver's side rear seat of my 300E (orange crayon on parchment) and it melted in the summer sun here in NorCal last summer. I thought the color would become permanent, but it came out. I can't tell you how, as I didn't do that detailing.

__________________
David

His:
2003 Dodge Durango SLT
2002 BMW E39 530i Sport
1988 Mercedes 300TE
Hers:
2003 Chevrolet Suburban
1999 E430