Rate leaf spring vehicle suspension system

A variable rate leaf spring vehicle suspension system comprising:

• a chassis rail;
• and
• a leaf spring arrangement comprising:
• a first leaf spring operatively coupled at a first end and a second end to the chassis rail;
• a second leaf spring coupled to the first leaf spring in a stacked arrangement, at least one of the first leaf spring and the second leaf spring formed of a composite material;
• a first bumper operatively coupled to the second leaf spring, the first bumper spaced from the first leaf spring in a first condition of the leaf spring arrangement and in contact with the first leaf spring in a second condition of the leaf spring arrangement, the first bumper located proximate an end of the second leaf spring;
• a second bumper operatively coupled to the second leaf spring and located proximate an end of the second leaf spring opposite the end that the first bumper is located;
• and
• a third bumper operatively coupled to the first leaf spring, the third bumper spaced from the chassis rail in a third condition of the leaf spring arrangement and in contact with the chassis rail in a fourth condition of the leaf spring arrangement, contact between the third bumper and the chassis rail providing a third spring rate of the leaf spring arrangement.