The 4 State Trucks Blog

When it comes to your semi truck’s power system, batteries are the lifeline for nearly any application, from your lighting to your sleeper loads (interior appliances). In this brief guide, we’ll cover how to swap out and maintain your commercial truck’s batteries, as well as what battery cover boxes you should buy for maximum protection. Here’s the fastest way: disconnect the negative cables first, remove the old batteries, clean off the connections, and install a new Gro …

Getting the right tire inflation pressure on your semi-truck can prevent underinflation (which wears down the tires and increasing rolling resistance) and overinflation (which leads to a blowout on the side of the road). Adding the appropriate amount of air pressure to your big rig will keep you and other motorists safe. To find the correct PSI for your tires, check your owner’s manual, or find it on the commercial vehicle’s tire placard. The number is based on various factors, such …

Aside from your truck's engine, heavy-duty shocks are among the most critical parts that affect ride quality, suspension performance, and the amount of wear on tires. Here’s a quick rundown of the best shocks for semi trucks that we sell at 4 State Trucks, as well as semi truck shock technology, signs of failure, and a few buying tips.  Key Takeaways Shocks improve stability, braking, ride comfort, and tire wear. Replace them when you notice leaks, bouncing, vibration, swaying, or t …

Looking to add some power to your truck’s voice and match your exterior chrome-polished aesthetic? Find the best semi truck air horn or train horn. In this guide, we’ll cover the top semi air horn brands, materials/finishes, mounting options, decibels, sound profiles, and more. Key Takeaways Air horns add distinct sound and style to semi trucks, whereas train horns have deeper, louder tones (AKA- literally used on freight trains - and often illegal for semi trucks to use). Choose a …

Wondering about the best aftermarket fuel tank accessories and parts to get? Here's a quick guide on the various types of semi truck fuel tank accessories, from locking caps to fuel tank covers, and replacement diesel fuel tank components that you can buy to start customizing your commercial truck. We’ll cover the top fuel tank accessories, how a fuel tank works, maintenance and upkeep, parts of a fuel tank, fitment specs, and a buyer’s checklist. Key Takeaways Match each accessor …