[Rachelsdad]

Another vote for tire straps.

Quick anecdote:

When I took delivery of my two '56 Safaris in August, the transporter tightened the straps so much that the underinflated front tire's bead on one of the cars broke. While most of us here have had the experience of mounting tires, getting the bead to snap back in while still on the car was a new one for me. I had to put my roller jack on the trailer to lift the car enough to take the weight off the wheel. (This was an open trailer, and it was pouring rain at the time, too, just for extra fun.)

Moral of the story: make sure your tires are properly inflated before you tighten the straps!