Let me see if I can find a way to put that in perspective. One example is this rig I just finished.
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I took the owner on a short test drive because I know most of them are fairly timid and will not drop the right side tires off the pavement onto the dirt shoulder at 55 mph just to see what it does. So, I do the driving. I have a test hill I take them up at street pressure in 2wd to show the traction that the rig makes. Thankfully on this day the owner was in the passenger seat when we were coming down the rutted hill and I put the right side up to really lean the rig over while driving.
That hill ends in a cul-de-sac about 2 long blocks from my driveway. I holed the right rear tire at the bottom of the hill based on the size of the hole and how long it took it to go flat. It went flat just as I turned into my driveway. The example for perspective is I am the only one who knew it was flat or going flat just because of how it sounded. There was nothing about the way the chassis felt that said one side is lower by several inches than the other. The owner was surprised when I hopped out to look with a "I wonder if that is what it sounds like" comment followed by a "yep, thought so, tire is flat".
The second is I can easily swap in a 150 lb spring in place of a 160 upper on one side, screw the adjuster to fix the ride height and there would never be anything the rig would do that you could perceive to know I had done that.
Also why we always need to keep this in full context.