I would imagine they have they same problems as a leaf sprung truck as far as being to soft or too heavy. I would say that my F150 is fairly undersprung but it does ok. At least the 5 link is better controlled and doesn't have issues like axle wrap and weird twisting of the leafs and those dumb jitters you get when you hit weird, off-angle bumps.But that's running empty, right?
I totally get that it can be tuned to ride really nice at empty or loaded. But both?
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Plus, you can option auto leveling air bags on both the 1500 and 2500 instead of coil springs. That takes care of the problem entirely. It levels the truck and it increases the spring rate based on the load by default.