I have heard the 4th gens has issues but even then when I was looking at air vs no air I did extensive research and on the forums in some of the larger threads with plenty sample size there was I’ve 75% of owners that were problem free with air suspension. As far as I’m aware the whole system was revamped anyway for the 5th gen ram. Ultimately, I own a 19 ram with air equipped suspension so I really won’t be swayed away at this point. I’ve had zero problems, even in the cold at negative zero degree days where most people reported issues. Every vehicle brand has their issues but air suspension is utilized on many vehicles, across many brands, and often the parts that fail are because of lacking maintenance. Air suspension is less forgiving to those who don’t properly upkeep their vehicles but that doesn’t mean it should be avoided.