Tire Pressure

Okay so I looked up the name of your trailer and googled "meritor wabco tire inflation system" and ended up seeing this video. Watch this and see if it helps: https://www.meritor.com/products/meritor-tire-inflation-system

So in watching that it seems that your system is designed to push air out and you should be able to hear it near the tire in question or you might have something on your dash or front console somewhere that says "ThermAlert" So yeah definitely get this checked out asap it's not safe.

 

OMG, I just learned something too! We can check it!!!

 

EXTREMELY great job on checking that. You don't want a steer tire blowout. Those are scary from what I've seen on youtube.

 

The first part is him just checking it by hand unscrewing it. He only used a wrench when he need to replace it. Just try unscrewing it by hand and then pushing the tire pressure gauge into the end of the hose. Follow the video tutorial and you should be good?.

Thanks for posting all those pics and sucks we couldn't find any indicator for you. It appears that for your system it's all audible near the tire. What about the "Alerts" option on your dash? Anything?

 

Middle picture, top light.

Thump the tires with a hammer. Thump one you know is inflated and remember the sound.