There’s nothing inherently wrong with coil springs for heavy duty work. Plenty of luxury cars had leafs, plenty of extremely heavy duty trucks have coils.
The problem with the new Ram 2500 coil spring suspension is how narrow it is.
The springs are too close together, too far inboard. They’re unable to resist sway with a top heavy load like a camper because of that unfortunate placement.
It’s not what the springs are, it’s where the springs are.
A friend of mine bought one to replace his ‘07 Chevy. Huge mistake. He can’t even drive over maybe 40 mph without the thing trying to do sideways somersaults. Camper rode on it once, never again. It’s useless for that.
The leaf spring setup has a wider stance, they’re mounted further outboard in the chassis.
That’s why they work better in that Ram.
