Nilight Steel Trailer Light Box Kit with Oval Tail, Round Marker & 3-LED License Lamp — Black Powder-Coated, Prewired

The Nilight Steel Trailer Light Boxes Kit is a ready-to-mount steel housing preloaded with oval tail, round side marker, and 3-LED license plate lights to give trailers durable, weather-resistant rear signaling and visibility.

Designed for trailer builders, repair shops, and DIY owners, this kit combines a corrosion-resistant steel box with bright SMD LEDs to replace or upgrade rear lighting assemblies. It arrives assembled with pre-cut mounting holes and pigtail wiring for quick hardwire installation and can be welded or bolted to most trailer frames. The package emphasizes durability, clear stop/turn/tail signaling, and a dedicated license plate lamp for improved legal compliance and nighttime visibility.

How does this kit improve trailer visibility and signaling?

The kit uses high-quality SMD LEDs tuned for distinct stop/turn and tail functions so other road users can quickly recognize braking and turning. A three-LED license plate light ensures the plate is illuminated while separate high/low intensity modes maintain clear tail lamp recognition.

• Bright red SMD LEDs for stop/turn functions for rapid response visibility.
• Lower-intensity tail/side marker illumination for continuous running lights.
• Dedicated 3-LED license plate lamp to meet common lighting requirements.
• Distinct wiring colors simplify hooking into existing trailer circuits (red/black/white).

What makes the steel light box durable in harsh conditions?

The housing is constructed from heavy-duty steel with a black powder-coat finish that resists rust, chipping, and fading. Pre-cut holes and welded mounting points are reinforced to withstand vibration and road debris, so the assembly stays secure over time.

• Heavy-gauge steel body for impact and flex resistance.
• Black powder-coating for corrosion protection and a clean appearance.
• Sealed light openings and hardware designed for all-weather exposure.
• Pre-cut holes sized for 6" oval and 2" round lights for consistent fitment.

How easy is installation and wiring for the average user?

The lights arrive mounted in the box and use three pigtail wires so you only need to hardwire to your trailer harness and attach the box to the frame. The color-coded wires and included O-ring terminal for ground speed up the connection process.

• Wire colors: white = ground, black = tail/marker + license lamp, red = stop/turn.
• Preassembled lights reduce assembly steps — no separate lamp mounting required.
• Mounting options: weld-on or bolt-on to rear, side, bottom, or top frame locations.
• Clear pre-cut openings match common light sizes for plug-and-play fitment.

Can this kit be used for new trailers and repairs?

Yes — the box is designed for both original builds and retrofit projects. Its universal mounting pattern and standard light dimensions let it replace worn housings or serve as the final assembly on a new trailer frame.

• Works as a complete rear tail light guard box for new or existing trailers.
• Pre-cut holes and standard lamp sizes simplify retrofits and replacements.
• Compatible with common trailer wiring configurations and mounting methods.
• Solid construction minimizes long-term maintenance on repaired trailers.

Who is this for: The Nilight Steel Trailer Light Boxes Kit is aimed at trailer builders, boat trailers, utility trailer owners, and service shops that need a reliable, weatherproof rear lighting assembly with clear stop/turn/tail signals and a license plate lamp. If you want a preassembled, heavy-duty solution that installs quickly and withstands outdoor use, this kit is built to meet those needs.