If you have to pull on an open trailer, you can at least build a shield across the front of the trailer and a couple feet down each side to block sand and gravel from the tow vehicle and passing trucks. Also, if its an open bottom trailer, block off that as well. Nothing elaborate, just plywood and 2x4's, making sure to brace it well. Your car will still get some splatters and road grime if its wet or snowy, but nothing that can't be cleaned off (unlike paint chips).
I bought their better than flannel grade in-the-garage cover, custom made for Cobra for about $130. They also sell a Miata cockpit cover which I also bought, but haven't taken out of box. It's supposed to fit. I think it was in the $60 range.
Ask SRP if you should use a car cover while towing an open trailer. I'm sure he will say not to do it. You spent a lot of money to paint and make the car beautiful. Do what ever it takes to get your baby home and undamaged.
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