I have done that with 2 bows, one a compound. I left it on the roof and drove about 5 miles, came to a stop sign and it slide off unto the hood and out into the road and I ran over it myself, did that with a deer when I was kid too!!, That is a diffferent story though. The next time was with a new Kempf Kwyk styk, I left the same place as I did when I killed the first bow but this time I went another route, drove about 6 miles and heard a rattling sound, looked in the back seat and no bow, OOhh OOO!! I come to a slow stop, get out and it is a hanging off my roof rack by my quiver. This is a 55mph. road and I do not do the speed limit. I feel your pain, but I have been there and done that. Shawn