Pretty pathetic flex on my Stepside Chevy. The suspension does almost nothing. However... the frame...
Here's when I let a friend drive my mud bogger onto a trailer. I was surprised it flexed out this well for 8" lift leaf springs. Plus lots of frame flex and body mounts almost pulling out.
My orange K5 actually flexed out better before the rear shackle flip for some reason. Here, shown with the shackle flip, it lifted a tire when I had a friend drive it up onto my 44.