Does my trailer need working lights if you can still see the lights on my truck?

Yes.

All required lamps must be operational on the rearmost vehicle in any combination (e.g., brake lights, taillights, turn signals, four-way flashers, clearance, identification, side marker, license plate lights).  (49 CFR §393.9(a) and 393.11)

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1. Does my trailer require a safety chain?
2. Does my trailer need working lights if you can still see the lights on my truck?
3. Are mudflaps required in Kansas?
4. Are snow chains required to be carried or used in Kansas?
5. What are the laws concerning window tint on commercial vehicles