If it's more than 125,000 miles use EACH TIME, you need new ones. Big rig shocks in general across the board are garbage and the technology hasn't changed in over 50 years.
How's your tire wear and inflation?
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How many miles should u get out of shocks and a front end alignment? My truck has gotten were it drives rough, I've had tires changed but nonething else to the front end in 3 years. Is there something else I should look at or should I just take to a shop and have them check it over?