Methods and apparatus for vehicle suspension having multiple gas volumes

A gas spring system for use in a suspension system, comprising:

• a first chamber having a mechanical spring member therein, said mechanical spring member compressible in a compression stroke of said suspension system, said first chamber configured to contain a gas therein, wherein, in said compression stroke, both said gas and said mechanical spring together to determine a spring rate of said first chamber, and wherein said mechanical spring member primarily forms said spring rate of said first chamber over a first portion of said compression stroke;
• a second chamber isolated from the first chamber, the second chamber having gas therein, the gas in said second chamber compressible in the compression stroke, said second chamber isolated from said first chamber;
• wherein said spring rate of said first chamber and the gas in said second chamber jointly form a spring rate of said gas spring system in the compression stroke;
• a shaft extending along a center of said suspension system, wherein said shaft extends through said second chamber;
• a piston coupled with said shaft, wherein said piston does not sealingly engage an inner surface of said second chamber;
• and
• wherein said first chamber is fillable through a first fill valve located at a lower end of said suspension system.