This is the primary cause of trailer-light problems. Symptoms include flickering, fast-blinking, dimness, intermittent operation (often when a trailer ball is used for a ground), and complete failure.
The Family Handyman on MSN

12 ideas to upgrade your utility trailer

Want to upgrade your trailer? Find 12 custom utility trailer ideas to boost safety, storage and performance with handy ...
With fishing seasons nearing, now is the time to give some thought to the most common problems related to boat trailers: lights and wheel bearings. LIGHTS: The most common headache with boat trailers ...
Utility Trailer Manufacturing Co. is making light emitting diode (LED) lighting a standard feature on all its refrigerated and dry van trailers as well as on its tandem and tridem axle flatbeds. “In ...