I have the stock shocks on both mine. The Blazer came with Bilsteins ($250 each new) that have held up fine for 210K miles. The Denali has air shocks from the factory in the back and they're very expensive. It's rare we ever replace them in the shop for mileage. Usually there's a noise or a leak. The bounce test works good.
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2010 Silverado ECSB LS 4x4. Only mods so far are a K&N drop in filter and a Rough Country 2" front level kit