I never take the rear wheel covers off to check or add pressure to my dually. I have a few long air chucks that work great. I bought a tire air gauge that fills the tire and also reads the pressure in one easy step for each tire. Takes me a few minutes to check and/or add air when I do it. Had a TPMS on my dually motorhome years back and it was more trouble than what it was worth. The best part was on those cold winter mornings about 3 AM when the tires got cold making the air pressure to go down, and causing the alarm in the monitor to go off.