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A suspension assembly having a frame hanger, a first control arm mounted between the frame hanger and an axle attachment member, a second control arm mounted to the frame hanger and to the axle attachment member, wherein the second arm extends from a centerline of the first control arm at an angle a

A suspension assembly having a frame hanger, a first control arm mounted between the frame hanger and an axle attachment member, a second control arm mounted to the frame hanger and to the axle attachment member, wherein the second arm extends from a centerline of the first control arm at an angle alpha such that the first control arm and the second control arm are not parallel to each other, wherein the centerline of the first control arm and the centerline of the second control arm extend to intersect at a point that is at a virtual center of rotation.

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1. A suspension assembly for supporting a longitudinally extending vehicle frame rail, comprising: a frame hanger having a frame attachment portion adapted for mounting to the vehicle frame rail;an axle attachment member mounted to an end of a first vehicle axle;a first control arm having a first en

1. A suspension assembly for supporting a longitudinally extending vehicle frame rail, comprising: a frame hanger having a frame attachment portion adapted for mounting to the vehicle frame rail;an axle attachment member mounted to an end of a first vehicle axle;a first control arm having a first end mounted to, and extending from, a first frame hanger boss positioned on the frame hanger, and a second end mounted to the axle attachment member by clamping a pair of U-shaped bolts over a first transverse bar pin bushing assembly;a second control arm having a first end mounted to a second frame hanger boss positioned on the frame hanger, and a second end mounted to the axle attachment member by clamping the pair of U-shaped bolts over a second transverse bar pin bushing assembly;wherein the second control arm extends from a centerline of the first control arm at an angle alpha so that the first control arm and the second control arm are not parallel to each other;wherein the angle alpha is from about 9 degrees to about 23 degrees;wherein the first control arm has a centerline that extends from the first end of the first control arm to the second end of the first control arm;wherein the second control arm has a centerline that extends from the first end of the second control arm to the second end of the second control arm;wherein the centerline of the first control arm and the centerline of the second control arm extend to intersect at a point that is at a virtual center of rotation;wherein the virtual center of rotation is located from about 35 inches to about 50 inches from the centerline of the first vehicle axle;wherein a centerline of the first vehicle axle is positioned at a distance D from a centerline of a second vehicle axle, and the virtual center of rotation is positioned at a distance that is 77% to 91% of distance D from the first axle. 2. The suspension assembly of claim 1, wherein the frame attachment portion comprises one or more frame hanger brackets that are attached to the frame hanger. 3. The suspension assembly of claim 2, wherein two frame hanger brackets are each bolted to the frame hanger. 4. The suspension assembly of claim 1, wherein the first control arm has a cross section that is the same as a cross section of the second control arm. 5. The suspension assembly of claim 1, wherein the angle alpha is from about 16 to about 20 degrees. 6. The suspension assembly of claim 1, wherein the suspension assembly is configured as a trailing configuration with control arms positioned closer to the front of a vehicle than the first vehicle axle. 7. The suspension assembly of claim 1, wherein the suspension assembly is configured as a leading configuration with control arms positioned further from the front of a vehicle than the first vehicle axle. 8. The suspension assembly of claim 1, wherein the virtual center of rotation is located from about 38 inches to about 42 inches from the centerline of the first vehicle axle. 9. The suspension assembly of claim 1, further including a transverse rod having a first end attached to the inboard side of the vehicle frame rail and a second end attached to the first vehicle axle at a position inboard from the vehicle frame rail. 10. The suspension assembly of claim 1, wherein a suspension assembly configured in the same manner as set forth in claim 1 is mounted to a second frame rail on the opposite side of the vehicle, with a spacing having a distance X measured between the centerlines of the control rods on opposite sides of the suspension. 11. The suspension assembly of claim 10, wherein virtual center of rotation is positioned at a distance from the centerline of the first vehicle axle that is 83% to 131% of lateral distance X. 12. The suspension assembly of claim 11, wherein the virtual center of rotation is positioned at a distance from the centerline of the first vehicle axle that is from about 95% to about 110% of lateral distance X. 13. The suspension assembly of claim 11, wherein the lateral distance X is from about 38 to about 42 inches. 14. The suspension assembly of claim 12, wherein the lateral distance X is between about 38 and about 42 inches. 15. The suspension assembly of claim 1, wherein a spring mount extends from the axle attachment member on an opposite side of the axle attachment member than the first and second control arms, and is secured to the axle attachment member with the U-shaped bolts. 16. The suspension assembly of claim 15, wherein an air spring is positioned atop the spring mount and attached to the vehicle frame rail. 17. The suspension assembly of claim 16, wherein a shock absorber is positioned atop the spring mount and attached to the vehicle frame rail. 18. The suspension assembly of claim 1, wherein the first control arm and the second control arm are in a plane that is parallel to a plane containing a centerline of the vehicle. 19. The suspension assembly of claim 1, wherein the first control arm extends horizontally from the frame hanger. 20. The suspension assembly of claim 19, wherein the first control arm is positioned above the second control arm. 21. The suspension assembly of claim 19, wherein the first control arm is positioned below the second control arm. 22. A suspension assembly for supporting a longitudinally extending vehicle frame rail above first and second vehicle axles forming a tandem axle configuration, comprising: a frame hanger having a frame attachment portion adapted for mounting to the vehicle frame rail;a first axle attachment member mounted to the first vehicle axle;a first control arm having a first end mounted to, and extending from, a first frame hanger boss positioned on the frame hanger, and a second end mounted to the first axle attachment member by clamping a first pair of U-shaped bolts over a first transverse bar pin bushing assembly;a second control arm having a first end mounted to a second frame hanger boss positioned on the frame hanger, and a second end mounted to the first axle attachment member by clamping the first pair of U-shaped bolts over a second transverse bar pin bushing assembly;wherein the second control arm extends from a centerline of the first control arm at an angle alpha so that the first control arm and the second control arm are not parallel to each other;wherein the angle alpha between the first and second control arms is from about 9 degrees to about 23 degrees;wherein the first control arm extends from the first frame hanger boss and has a centerline that extends from the first end of the first control arm to the second end of the first control arm;wherein the second control arm extends from the second frame hanger boss and has a centerline that extends from the first end of the second control arm to the second end of the second first control arm;wherein the centerline of the first control arm and the centerline of the second control arm extend to intersect at a point that is at a first virtual center of rotation;wherein the first virtual center of rotation is positioned about 35 inches to about 50 inches from a centerline of the first vehicle axle;a second axle attachment member mounted to the second vehicle axle;a third control arm having a first end mounted to, and extending from, a third frame hanger boss positioned on the frame hanger, and a second end mounted to the second axle attachment member by clamping a second pair of U-shaped bolts over a third transverse bar pin bushing assembly;a fourth control arm having a first end mounted to a fourth frame hanger boss positioned on the frame hanger, and a second end mounted to the second axle attachment member by clamping the second pair of U-shaped bolts over a fourth transverse bar pin bushing assembly;wherein the fourth control arm extends from a centerline of the third control arm at an angle alpha so that the third control arm and the fourth control arm are not parallel to each other;wherein the angle alpha between the third and fourth control arms is from about 9 degrees to about 23 degrees;wherein the third control arm extends from the third frame hanger boss and has a centerline that extends from the first end of the third control arm to the second end of the third control arm;wherein the fourth control arm extends from the fourth frame hanger boss and has a centerline that extends from the first end of the fourth control arm to the second end of the fourth control arm;wherein the centerline of the third control arm and the centerline of the fourth control arm extend to intersect at a point that is at a second virtual center of rotation;wherein the second virtual center of rotation is positioned about 35 inches to about 50 inches from a centerline of the second vehicle axle;wherein the first virtual center of rotation and the second virtual center of rotation are positioned at a distance that is 77% to 91% of a distance D which is the distance between the centerlines of the first vehicle axle and the second vehicle axle. 23. The suspension assembly of claim 22, wherein the first control arm has a cross section that is the same as a cross section of the third control arm, and the second control arm has a cross section that is the same as a cross section of the fourth control arm. 24. The suspension assembly of claim 22, wherein the first control arm extends horizontally from the frame hanger, and the third control arm extends horizontally from the frame hanger. 25. The suspension assembly of claim 22, wherein the suspension assembly is configured as a leading-trailing configuration with the third and fourth control arms positioned further from the front of a vehicle than the second vehicle axle, and the first and second control arms positioned closer to the front of a vehicle than the first vehicle axle. 26. The suspension assembly of claim 25, wherein the first virtual center of rotation is located forward of the first vehicle axle, and the second virtual center of rotation is located aft of the second vehicle axle. 27. The suspension assembly of claim 26, further including a transverse rod having a first end attached to the inboard side of the vehicle frame rail and a second end attached to the second vehicle axle at a position inboard from the vehicle frame rail. 28. The suspension assembly of claim 22, wherein the centerline of the first vehicle axle is positioned a distance D that is about 52 inches to about 55 inches from a centerline of a second vehicle axle. 29. The suspension assembly of claim 22, wherein the frame hanger is positioned midway between the first vehicle axle and the second vehicle axle. 30. The suspension assembly of claim 22, wherein the angle alpha between the first and second control arms is from about 16 degrees to about 20 degrees, and the angle alpha between the third and fourth control arms is from about 16 degrees to about 20 degrees. 31. The suspension assembly of claim 22, wherein the first virtual center of rotation is located from about 38 inches to about 42 inches from the centerline of the first vehicle axle, and the second virtual center of rotation is located from about 38 inches to about 42 inches from a centerline of the second vehicle axle. 32. The suspension assembly of claim 22, wherein a suspension assembly configured in the same manner as set forth in claim 27 is mounted to a second frame rail on the opposite side of the vehicle, with a spacing having a distance X measured between the centerlines of the control rods on opposite sides of the suspension. 33. The suspension assembly of claim 32, wherein the first virtual center of rotation is positioned at a distance from the centerline of the first vehicle axle that is 83% to 131% of lateral distance X, and the second virtual center of rotation is positioned at distance from the centerline of the second vehicle axle that 83% to 131% of lateral distance X. 34. The suspension assembly of claim 33, wherein the first virtual center of rotation is positioned at a distance from the centerline of the first vehicle axle that is from about 95% to about 105% of lateral distance X, and the second virtual center of rotation is positioned at a distance from the centerline of the second vehicle axle that is from about 95% to about 105% of lateral distance X. 35. The suspension assembly of claim 22, wherein a spring mount extends from the axle attachment member on an opposited side of the first axle attachment member than the first and second control arms, and is secured to the first axle attachment member with the first pair of U-shaped bolts. 36. The suspension assembly of claim 35, wherein an air spring is positioned atop the spring mount and attached to the vehicle frame rail. 37. The suspension assembly of claim 36, wherein a shock absorber is positioned atop the spring mount and attached to the vehicle frame rail. 38. The suspension assembly of claim 37, wherein the first, second, third, and fourth control arms are in a plane that is parallel to a plane containing a centerline of the vehicle. 39. The suspension assembly of claim 22, wherein the configuration of the first and second control arms is symmetrical with the configuration of the third and fourth control arms. 40. The suspension assembly of claim 39, wherein the suspension assembly is non-reactive to braking and driving axle torque. 41. The suspension assembly of claim 39, wherein a roll oversteer gradient in the first vehicle axle will be the balanced by a roll understeer gradient developed in the second vehicle axle. 42. The suspension assembly of claim 39, wherein the centerline of the first control arm is coaxial with the centerline of the third control arm. 43. The suspension assembly of claim 22, where a lateral offset on the conical deflection of lower control arm bushings about the vertical (Z) axis results in a conical moment (MZ) being developed in the lower control arm bushings and reacted through the bending stiffness of the lower control arms.