Trailers can make sense for some folks on some trips, but when comparing weight to panniers, don't forget to includes spare tubes, or the fact that you still need to include some kind of bag for the gear. If you use the bag designed of the trailer they are not particularly light.

On the other hand some folks go heavier than a BoB trailer with the heaviest duty Arkel panniers and handlebar bag mounted on super heavy Surley Nice Racks. That can come in heavier than the trailer even when including a big bag and a couple spare tubes.