I have a 2008 Ford F-350 with a trailer hitch attachment?

One of my employees was backing the trailer into the warehouse and backed up into a yellow warning pole and cracked the right taillight. Well after he hit the pole the lights on the trailer would not work at all. I put on another trailer on the 350 and still no lights. I checked the fuses and saw nothing. What should I do? Maybe double check the fuses? Or is it the electrical plug on my truck?