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A suspension system for a vehicle having a frame includes a first interface member configured to be positioned on a first lateral side of the frame and a second interface member configured to be positioned on an opposing second lateral side of the frame. The first interface member and the second int

A suspension system for a vehicle having a frame includes a first interface member configured to be positioned on a first lateral side of the frame and a second interface member configured to be positioned on an opposing second lateral side of the frame. The first interface member and the second interface member are positioned along a common central axis. The suspension system also includes a first swing arm coupled to the first interface member and configured to rotate about the common central axis, a second swing arm coupled to the second interface member and configured to rotate about the common central axis, and a sway bar coupled to the first interface member and the second interface member. The sway bar is positioned coaxially with the common central axis and extends between the first swing arm and the second swing arm.

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1. A suspension system for a vehicle having a frame, the suspension system comprising: a first interface member configured to be positioned on a first lateral side of the frame;a second interface member configured to be positioned on an opposing second lateral side of the frame, wherein the first in

1. A suspension system for a vehicle having a frame, the suspension system comprising: a first interface member configured to be positioned on a first lateral side of the frame;a second interface member configured to be positioned on an opposing second lateral side of the frame, wherein the first interface member and the second interface member are positioned along a common central axis;a connector coupled to the first interface member, the connector comprising: an outer support member configured to be coupled to the frame of a heavy duty truck or trailer; andan inner race coupled to an outer surface of the first interface member and positioned at least partially within the outer support member;a flange extending radially outward from the outer surface of the first interface member;a thrust bearing disposed between the flange and at least one of the inner race and the outer support member, wherein the flange is configured to engage the thrust bearing and limit axial movement of the first interface member;a first swing arm coupled to the first interface member and configured to rotate about the common central axis;a second swing arm coupled to the second interface member and configured to rotate about the common central axis; anda sway bar coupled to the first interface member with a first splined connection and coupled to the second interface member with a second splined connection, the sway bar positioned coaxially with the common central axis and extending between the first swing arm and the second swing arm. 2. The suspension system of claim 1, wherein the first splined connection includes a male and female spline having a first diameter and the second splined connection includes a male and female spline having a second diameter that is greater than the first diameter. 3. The suspension system of claim 1, wherein the first splined connection includes a first number of teeth and the second splined connection includes a second number of teeth. 4. A suspension system for a vehicle having a frame, the suspension system comprising: a first swing arm configured to be positioned on a first lateral side of the frame;a first interface member coupled to the first swing arm;a second swing arm configured to be positioned on an opposing second lateral side of the frame;a second interface member coupled to the second swing arm;a connector coupled to the first interface member, the connector comprising: an outer support member configured to be coupled to the frame of a heavy duty truck or trailer; andan inner race coupled to an outer surface of the first interface member and positioned at least partially within the outer support member;a flange extending radially outward from the outer surface of the first interface member;a thrust bearing disposed between the flange and at least one of the inner race and the outer support member, wherein the flange is configured to engage the thrust bearing and limit axial movement of the first interface member; anda torsion spring extending through at least a portion of the first swing arm and at least a portion of the second swing arm, the torsion spring coupled to the first interface member with a first splined connection and coupled to the second interface member with a second splined connection, wherein the torsion spring is a continuous bar that defines a central axis about which both the first swing arm and the second swing arm rotate. 5. The suspension system of claim 4, wherein the first splined connection includes a male and female spline having a first diameter and the second splined connection includes a male and female spline having a second diameter that is greater than the first diameter. 6. The suspension system of claim 4, wherein the first splined connection includes a first number of teeth and the second splined connection includes a second number of teeth. 7. The suspension system of claim 4, further comprising a cap coupled to at least one of an end of the torsion spring and the first interface member, wherein the cap is positioned to limit movement of the torsion spring along the central axis. 8. A suspension system for a vehicle having a frame, comprising: a first interface member;a second interface member, wherein the first interface member and the second interface member are positioned along a common central axis;a connector coupled to the first interface member, the connector comprising: an outer support member configured to be coupled to the frame of a heavy duty truck or trailer; andan inner race coupled to an outer surface of the first interface member and positioned at least partially within the outer support member;a flange extending radially outward from the outer surface of the first interface member;a thrust bearing disposed between the flange and at least one of the inner race and the outer support member, wherein the flange is configured to engage the thrust bearing and limit axial movement of the first interface member;a first body member coupled to the first interface member and configured to rotate about the common central axis;a second body member coupled to the second interface member and configured to rotate about the common central axis; anda torsion spring coupled to the first interface member with a first splined connection and coupled to the second interface member with a second splined connection, wherein the torsion spring is disposed along the common central axis.