[Fulltiming]

I would like to thanks Glenn @"Glenn and Laureen" for noticing that Part 4 of the Newell Air System Fundamentals was not Part 4, it was a partial repeat of Part 3. I have corrected the error and anyone who is interested in the way the tag axle air system works should view the newly uploaded Part 4 here: https://youtu.be/dSkrV1RqzBo