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A suspension for a cab of an over the highway truck or tractor. The suspension includes a pair of spaced apart springs and a pair of spaced apart motion dampers interposed between and connected to the cab and a frame of the truck or tractor. A third spring is mounted to one of the frame or the cab.

A suspension for a cab of an over the highway truck or tractor. The suspension includes a pair of spaced apart springs and a pair of spaced apart motion dampers interposed between and connected to the cab and a frame of the truck or tractor. A third spring is mounted to one of the frame or the cab. A panhard rod has a first end connected to the third spring. A second end of the panhard rod is connected to one of the frame or cab that does not mount the third spring. The third spring biases the cab to a centered position relative to the frame.

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1. A suspension for a cab of an over the highway truck or tractor having a frame that includes a pair of spaced apart frame rails and a transverse member interconnecting the rails, said suspension comprising:a) first and second spaced apart springs interposed between and connected to said cab and to

1. A suspension for a cab of an over the highway truck or tractor having a frame that includes a pair of spaced apart frame rails and a transverse member interconnecting the rails, said suspension comprising:a) first and second spaced apart springs interposed between and connected to said cab and to said transverse member for modulating relative motion of said cab with respect to said frame;b) a pair of spaced apart motion dampers interposed between and connected to said cab and said transverse member, said motion dampers interconnecting said cab and said frame to damp relative cab and frame movement both toward and away from one another;c) a third spring connected to one of said transverse member and said cab; andd) an elongated rigid rod having a first end connected to said third spring and a second end connected to an other of said transverse member and said cab, said rod and third spring adapted to bias said cab toward a centered position relative to said frame. 2. The suspension of claim 1 wherein said third spring is a torsion spring. 3. The suspension of claim 1 wherein said third spring is a rubber torsion spring that damps lateral movements of said cab. 4. The suspension of claim 1 wherein said third spring is connected to said transverse member, said first rod end is connected to said third spring, and said second rod end is connected to said cab. 5. In a suspension for a sleeper cab of an over the highway truck or tractor having a frame that includes a pair of spaced apart frame rails and a transverse member interconnecting the rails, said suspension comprising:a) pair of spaced apart springs interposed between and connected to said cab and to said transverse member for modulating relative motion of said cab with respect to said frame;b) a pair of spaced apart motion dampers interposed between and connected to said cab and said transverse member at locations between the pair of springs, said motion dampers being oppositely canted at acute angles relative to the frame, said motion dampers interconnecting said cab and said frame to damp relative cab and frame movement both toward and away from one another;c) an elongated rigid rod connected at a first end to said cab; andd) a torsion spring interposed between and connected to said rod and said transverse member, said rod and torsion spring positioned between said motion dampen, said rod and torsion spring adapted to bias said cab toward a centered position relative to said frame. 6. The suspension of claim 5 wherein said torsion spring is a rubber torsion spring that provides damping of lateral movements. 7. A method of damping relative lateral movements between a cab and a frame of an over the highway truck or tractor, comprising:a) connecting a spring to one of said frame and said cab;b) connecting a first end of an elongated rigid rod to said spring;c) connecting a second end of said elongated rigid rod to an other of said frame and said cab;d) biasing said cab toward a centered position relative to said frame;e) maintaining said cab in said centered position when inputs to said frame are below a threshold value;f) allowing lateral movement of said cab from said centered position when said inputs exceed said threshold value; andg) damping relative lateral movements between said cab and said frame with said spring. 8. The method of claim 7 wherein said spring is a torsion spring. 9. The method of claim 7 wherein said spring is a rubber torsion spring that damps said lateral movements of said cab. 10. A method of damping relative lateral movements between a cab and a frame of an over the highway truck or tractor, comprising:a) connecting a torsion spring to one of said frame;b) connecting a first end of an elongated rigid rod to said torsion spring;c) connecting a second end of said elongated rigid rod to said cab;d) biasing said cab toward a centered position relative to said frame;e) maintaining said cab in said centered position when inputs to said frame are belo w a threshold value;f) allowing lateral movement of said cab from said centered position when said inputs exceed said threshold value; andg) damping relative lateral movements between said cab and said frame with said spring. 11. A cab suspension configured to bias a cab of a truck or tractor vehicle toward a neutral or centered position relative to a support frame therefore, said cab suspension comprising:an elongate pan hard rod rotatably coupled, at each of two ends thereof, between two mountings, one of said two mountings configured for mounting to a cab of a truck or tractor vehicle and the other of said two mountings configured for mounting to a support frame for the cab; andone of said mountings further comprising a torsion spring, said torsion spring configured to bias said elongate pan hard rod toward a neutral or centered position corresponding to a neutral or centered position of the cab relative to the support frame for the cab. 12. The cab suspension as recited in claim 11, further comprising:a plurality of spaced apart springs configured to suspend the cab of a truck or tractor vehicle relative to the support frame. 13. The cab suspension as recited in claim 11, further comprising:a plurality of spaced apart motion dampers configured to dampen movement of the cab of a truck or tractor vehicle toward and away from the support frame. 14. The cab suspension as recited in claim 11, wherein said elongate pan hard rod has a fixed length. 15. The cab suspension as recited in claim 11, further comprising:a bushing interconnecting said elongate pan hard rod to mounting flanges of said mounting that comprises said torsion spring, said bushing configured to facilitate relative rotation between said elongate pan hard rod and said mounting flanges. 16. The cab suspension as recited in claim 11, further comprising:said elongate pan hard rod being interconnected to said mounting that comprises said torsion spring by a bushing, said bushing configured to facilitate relative rotation between said elongate pan hard rod and said mounting. 17. The cab suspension as recited in claim 16, said mounting that comprises said torsion spring further comprising:an outer sleeve rotatably interconnected to said elongate pan hard rod via said bushing;an inner sleeve configured for rotation relative to said outer sleeve and for fixed orientation relative to the cab of the vehicle or the support frame depending upon to which said mounting, that comprises said torsion spring, shall be mounted; anda plurality of rubber elements positioned between said outer sleeve and said inner sleeve, said rubber elements configured to bias said outer sleeve, relative to said inner sleeve, toward a configuration that corresponds to the neutral or centered position of the cab relative to the support frame. 18. The cab suspension as recited in claim 11, said mounting that comprises said torsion spring further comprising:an outer sleeve rotatably connected relative to said elongate pan hard rod;an inner sleeve configured for rotation relative to said outer sleeve and for fixed orientation relative to the cab of the vehicle or the support frame depending upon to which said mounting, that comprises said torsion spring, shall be mounted; anda rubber element positioned between said outer sleeve and said inner sleeve, said rubber element configured to bias said outer sleeve, relative to said inner sleeve, toward a configuration that corresponds to the neutral or centered position of the cab relative to the support frame. 19. The cab suspension as recited in claim 18, wherein said outer sleeve and said inner sleeve are each substantially square in cross-sectional shape. 20. The cab suspension as recited in claim 19, wherein longitudinal axes of said outer sleeve and said inner sleeve are each configured for substantially parallel orientation to a longitudinal axis of the vehicle. 21. The cab suspension as recited in claim 11, wherein a longitudinal axis of said elongate p an hard rod is configured for transverse orientation to a longitudinal axis of the vehicle. 22. A truck or tractor vehicle in which a cab of the vehicle is biased toward a neutral or centered position relative to a support frame for the cab, said vehicle comprising:a cab of a truck or tractor vehicle suspended upon a chassis, said cab biased toward a neutral or centered position relative to a support frame of said chassis;an elongate pan hard rod rotatably coupled, at each of two ends thereof, between two mountings, one of said two mountings mounted to the cab and the other of said two mountings mounted to the support frame; andone of said mountings further comprising a torsion spring, said torsion spring configured to bias said cab, via said elongate pan hard rod, toward a neutral or centered position relative to the support frame. 23. The vehicle as recited in claim 22, further comprising:said elongate pan hard rod being interconnected to said mounting that comprises said torsion spring by a bushing, said bushing configured to facilitate relative rotation between said elongate pan hard rod and said mounting. 24. The vehicle as recited in claim 23, said mounting that comprises said torsion spring further comprising:an outer sleeve rotatably interconnected to said elongate pan hard rod via said bushing;an inner sleeve configured for rotation relative to said outer sleeve and for fixed orientation relative to the cab of the vehicle or the support frame depending upon to which said mounting, that comprises said torsion spring, is mounted; anda plurality of rubber elements positioned between said outer sleeve and said inner sleeve, said rubber elements biasing said outer sleeve, relative to said inner sleeve, toward a configuration that corresponds to the neutral or centered position of the cab relative to the support frame. 25. The vehicle as recited in claim 24, wherein said outer sleeve and said inner sleeve are each substantially square in cross-sectional shape. 26. The vehicle as recited in claim 25, wherein longitudinal axes of said outer sleeve and said inner sleeve are each configured for substantially parallel orientation to a longitudinal axis of the vehicle. 27. The vehicle as recited in claim 22, wherein a longitudinal axis of said elongate pan hard rod is configured for transverse orientation to a longitudinal axis of the vehicle. 28. The vehicle as recited in claim 22, further comprising:a plurality of spaced apart springs configured to suspend the cab of a truck or tractor vehicle relative to the support frame. 29. The vehicle as recited in claim 22, further comprising:a plurality of spaced apart motion dampers configured to dampen movement of the cab of a truck or tractor vehicle toward and away from the support frame. 30. The vehicle as recited in claim 22, wherein said elongate pan hard rod has a fixed length.