Rock chips from towing, how to prevent?

The AR Dept of Transportation kindly decided to work on a stretch of US 67 or 16 (I forget which) while we were on the way home and now I've got roughly 26 little rock chips on the passenger side hull.

Questions - What can I do to repair the chips in my brittany blue gel coat and what do you guys do to prevent rock chips when towing?

I usually only tow ~1 mile from storage to the lake, but bring it home twice a year and on one road trip a summer, so I need to work on a solution for future towing...