take some pics for me please Andrew of how you have it mounted?
I have a spare bootlid for mine when i do that to avoid scratching and stuff.
Also always take off the pedal closest to the car incase a big pothole or bump jars teh bike enough during motion to hit the bodywork
The main thing you will notice, and i have with teh paddyhopkirk one i have, is if you really torque up the straps you could bend the lips on the bootlid. i havent had the need to do them that tight on any car as i usually take 1 or 2 bikes on it when used
and it cioped fine on a private road upto 120 leptons.
I cant see how it would mount on the window of a coop so it should be safe bar the bootlid scuffing and bumper scuffing at the top
www.kingpleb.talktalk.net has the pics of mine in there somewhere