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hybrid design is great for big delivery trucks because they generally are stop and go which is where hybrids have the biggest advantage. hydraulics on these trucks is great because you can rapidly store the power from regenerative breaking, more so than with electricity i would imagine because of the limitations of flow for batteries. another big, although not so obvious, advantage is the reduction of maintainence. since the hydraulics are stopping these trucks, the traditional brakes on these trucks last much longer. once a hydraulic system is set up properly it doesn't require a lot of maintenence either.
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