I broke the right rear leaf and just clamped them all back together rather than replacing it. I don't haul a lot of weight, and it passes PA inspections (3 years now). There's been no issue with it riding lower or anything like that on that wheel.
The cheapest way (free if you have the tools) is to flip the leaf spring hangers upside down.
Attaching a leaf spring to a chassis
A set of leaf spring that is so mounted that it is at right angles to the length of the Vehicle is known as the transverse leaf spring.
Sagging spring, most likely. Depending on the year, coil, or leaf, you will need to replace, or re-arc them.
I was looking at the 2001 Ford Ranger Owner Guide , in the Roadside Emergencies / changing a tire section , and the drawing shows the rear leaf springs being ABOVE ( on top ) the axle tubes
the eye of a leaf spring, assuming u mean the eye at end of spring, is used to bolt the spring to the vehicle
Multiple leafs lets the manufacture vary the load capacity of the vehicle. Not all manufactures use multiples, I think Ford went to a single fiberglass leaf spring on the Ranger PU. Some front wheel drive have one single on the back that runs side to side.
Click on the link below Click on Tech Library scroll down to lowering suspensions
optimized dimensions of a mono leaf composite spring
mono leaf
Smaller and stiffer shocks/springs on the front, remove a leaf spring or 2 on the back and get stiffer shocks/leafs back there as well.
the leaf spring on a vehicle's axle is an example