Larry,
The additional tanks are ping tanks. I'm not sure when Newell started using them. Ping tanks make the 'effective' air volume larger on an air spring. There should be a large diameter air hose going from the air spring to the ping tank. The idea is that the spring rate and the resonant frequency is reduced. Of course, as with everything else, there's no free lunch. At some cutoff frequency the ping tank can actually make the suspension harsher. Hopefully that frequency is above normal road input. Remember, the tires take quite an edge off road input so in practice ping tanks can provide an improvement in ride quality. Anyone know when Newell started using them?
David Brady
'02 Blue Bird Wanderlodge LXi
NC
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