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500lb curb weight difference isn't really all that big from the spring's perspective, especially in the back with the motion ratio what it is. It's an extra 125 lb per wheel give or take a dozen depending on distribution, for a 500 lb/in spring that's only 6mm extra deflection. It probably is a shortcut, but the newer chassis are stiffer, which means you can have a more compliant suspension and still maintain wheel control, so I don't think it's that big a deal
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