However you do it - don't do it like my 'boneheaded' brother did -
My sister and her husband found a "nearly perfect" Turbo Thunderbird several years ago, exactly like the one they bought new when the 'Bird was introduced back in the '80's. But it was in Indiana and they are in the U.P. - since my brother thought the car "bounced too much" on the trailer, and was worried about the springs and shocks, he threw 2 4" straps ACROSS the front and rear fenders, and cranked it down - it solved that problem - it didn't move anymore, but proceded to collapse both rear quarters and both front fenders. My sister could have killed him - they ended up scrapping the car, so much for the 'free' transport.....