When i trailered my GN from Miami to Virginia on my open trailer i was also worried about road debris chipping my paint. My solution: i went to the packing supply section at U-Haul and bought one of those big seran-wrap looking rollers that you would use to wrap large shipments. I wrapped the whole damn car A LOT. It made the trip without a scratch, the only thing is that the wrap left marks in the paint where it was rubbing due to the wind and the whole car looked like it had ghost zebra stripes. All i had to do was wax the car and it was good as new. I wouldnt hesitate to do it again.