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The letters likely indicate material composition. I wouldn't worry about it.

Don't be so hasty to delete stuff. These trucks breed like rabbits. Once you get one it attracts more quickly. Tow bars happen also. And if you make friends with the local reserve or national guard guys you may have a phone number you can call for a "recovery training mission" involving proper...

The check valve in your picture is a Haldex N13526BE

Yeah that 30 psi front reading sounds erroneous. The tanks are linked and for the front tank to be lower than the center tank by ~100 psi would require both a large leak and a restriction in flow from the center to front if I had to guess. The unloader on the compressor kicks in around 120 so...

In your picture the check valve is to the driver's side of the T. This is the check valve:

Under normal operation there should be no air present to the front glad hands. They have one-way check valves that should only allow air to flow IN to the front glad hands. Never out: https://www.psmagazine.army.mil/News/Article/2653537/fmtv-get-the-right-gladhand-couplings/