This past year we purchased a new Sundowner horse trailer. Over the last few months, we have had a few occasions to trailer at night. I checked all of the lights when we got the trailer and they worked perfectly. The first time we used it at night, there were no issues. Since then, we have lights randomly not working. Once it was the little clearance lights that ran around the trailer but the interior lights were working. Once when we left one location, the clearance lights were working but the interior lights were not working but when we got home, I flipped the interior lights on and they worked just fine. Then, last night, no interior lights once again and they never "magically" started working. Checked my truck fuses (2016 Silverado) and they all seem to be fine. I'm really frustrated. Nothing like trying to load a young, inexperienced horse in a trailer late at night when you can't see!