you can buy the shrink wrap that they use to wrap bulk items on pallets
have seen this on several cars going to ISCA car shows in the winter, stays tight on the body and doesn't buffer the paint at speed.
But personally I would not use anything. When we took my Dart to Carlisle my buddy that towed it over for me since i had my 15,000 mile 81 Imperial in my enclosed hauler built a cover for the front of his trailer so it worked as a rock guard. Got rained on on the way there and the car was really dirty. Little soap & water and it was back to looking good. Now why did I trailer, 10 hour drive and didn't have all the bugs worked out. Ended up with a damaged motor, so better to tow it than rent a trailer to tow it home.
Unless you have a few miles on your car and are sure it will go the distance then taking an insurance policy (trailer) with you is a good thing to do.