Coil vs leaf springs for off-road.

The leaf springs are preferred because they are robust and stout side-to-side, where coils springs give no lateral stability. Leaf springs are an attachment point, but coils require linkage to hold the truck to the axles.
In 4Low you might get "axle wrap" where the leaf springs allow the axle* to rotate, pushing the leaf down in front of the axle, up behind the axle, but otherwise the leafs do a good job connecting the truck to the axle all by themselves. Your leaf truck still might have some linkage to help, but that is for help and not a primary support.
Thus, is a big reason to use leafs for TC.

* when I say "axle" rotate, I am really meaning the housing the axle is in, the part you can see attached to the differential; the axle itself always rotates of course

kohidad hit a good point about location of the springs, this especially applies if you add air bags too. The suspension should be under the frame, or outside of it. Never put airbags inside of the frame as this will support the truck in a more narrow stance and make it more likely to sway and lean.The leaf springs are preferred because they are robust and stout side-to-side, where coils springs give no lateral stability. Leaf springs are an attachment point, but coils require linkage to hold the truck to the axles.In 4Low you might get "axle wrap" where the leaf springs allow the axle* to rotate, pushing the leaf down in front of the axle, up behind the axle, but otherwise the leafs do a good job connecting the truck to the axle all by themselves. Your leaf truck still might have some linkage to help, but that is for help and not a primary support.Thus, is a big reason to use leafs for TC.* when I say "axle" rotate, I am really meaning the housing the axle is in, the part you can see attached to the differential; the axle itself always rotates of course

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What are Leaf Spring Suspensions?

Leaf springs, as the name suggests, utilize long strips of steel ‘leaves’ that are secured to the vehicle’s frame at either end, and the axle is suspended from them at the middle. The springing action is provided by the leaves compressing and rebounding in response to the movements of the axle, as communicated by the tire and wheel that is rolling along the surface.

Leaf springs offer superior load-carrying capabilities, which is why you’ll find them, particularly at the rear axle, of heavy-duty vehicles such as larger pickup trucks and commercial vehicles. The flex of a leaf spring under load is far lower than a coil spring, and leaf springs are far more durable and less prone to breakage. However, this reduced flex also means that you can encounter a situation on an off-roader where a wheel leaves the ground under extreme axle articulation.

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The simplicity of the leaf spring system also means that it’s easier to increase or lower the ride height of a vehicle that’s equipped with them. However, this also limits the scope for suspension tuning, as the springs are attached to fixed points on the chassis. You can’t adjust suspension geometry as easily as you could with a coil spring.

Finally, leaf springs can be uncomfortable for passengers, as they tend to bounce more and absorb road impacts less. This is most apparent when the vehicle is loaded to less than half its capacity.

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