Bob, as the DOC says the blanket method on top of luggage, or whatever works very good. Someone here on the forum, I believe, Dan McEntee, used the blanket deal for years to haul 7-10 planes to contests when they were involved in racing, stunt, and other events. My flying Buddy and I have used the blankets to carry planes to contests in a Ford P/U and a 2010 Odyssey van with no problems. In the future I'll keep doing it. It ain't pretty and it ain't cool, but it works. They even stay put during a panic stop!
Doug