Rear ride height sensor. What it does?

[Spiffy]

Yesterday the tire shop removed my rear wheels. On the drivers side I saw what looked like a suspension height sensor.
I don't have the special shocks.
In a fully operational system how does all thus work?
Now that I have the sensor and a empty plug can I add a adjustable rear suspension?
When i load my trailer or I fill my bed with weight my truck sags.
When it sags my cruse camera nags me about alignment.
I was contemplating installing rear air bags.
But if I already have the making for leveling it it possible to finish the system?

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[tsigwing]

Thought that was for automatic headlight adjustment?

 

[Porpoise Hork]

Depending on the options your truck came with it could be for the headlight adjustment as @tsigwing suggested, or for the onboard scales system.

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