Dom, the foam on the shelf method worked really well for me. For the Panther you could use some foam blocks to support the wings. I got my foam cut to size from http://www.efoamstore.com/. I used velcro straps or bungees to hold the plane in place. I was not a fan of traveling with my planes on the gear. If your trailer is sprung wrong the models will take a heck of a beating on the gear. My new trailer is on air ride, no damage to anything now except my wallet.
Don