Odd Taillight

[LorenB]

2017 Laramie Longhorn. My right rear taillight was not properly installed. When I removed it, there was a 1” diameter paper air cleaned and hose behind if. Anyone know what this is for?

 

[MarineBSP]

Do you have air suspension ?

 

[LorenB]

I do - is it the air supply tube?