Go with rectangle license plate lights for a clean, low-profile fit that's easy to mount. Options include LED and 1- or 2-wire setups—match your trailer's ground style, and you can tie into a 4-way using brown for running lights and white for ground. Some lights include plate-mount hardware, so check what's in the box before you bolt it up.
Yes, use the brown wire for running lights and the white wire for ground on a 4-way. If your light has extra wires, test with a 12 volt battery to identify functions. Unused 4-way circuits can be capped or cut flush so they're out of the way.
Some do include hardware to mount a license plate, but not all. Check what's included so you're ready with fasteners if needed. Also note that some positive lead wires are 18 gauge, so match your connectors accordingly.
Mount the light so it's high enough to throw light across the whole tag. LEDs really light things up, but aim and placement matter. If lights blink on and off, check for a solid ground at the trailer-side connection and repair any bad ground to restore steady output.
Connect the power lead to your running light circuit and the other lead to a solid ground. Some older setups ground through the mounting bolt; if you have a 2-wire light, tie the light's ground to the trailer ground. If you see two same-color wires, one is power and the other is ground.
Yes, rectangle license plate lights and holders fit a standard 12" x 6" license plate. Match the light and bracket dimensions to your mounting area before drilling. If you're replacing an older unit, compare bolt spacing to ensure it lines up.
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