I've carried chickens (not Freedom Rangers) upside down many times in the past (over a period of 50+ years and never once had a problem. I had a hen Black Australorp that was once trapped (upside down) for 3 or 4 days and she didn't suffer any debilitating consequences, just lacked for water and feed. I believe some of the extremely fast growing heavy breeds are subject to meet their demise due to undue stress, stress for no apparent reason, and heart attacks. Lots of 4-H'ers and FFA boys locally lose many of the fast growing heavies each year for unknown reasons. Some just literally "drop dead". Just my experience, however, I've not been inclined to raise any of the fast growing heavies in the past.