Cargo Trailer Spring Maintenance Checklist

After a long winter, spring is the right time to give your cargo trailer a full inspection. Even if you live in a warmer climate, inspecting your trailer after it has been sitting for a while is always a good idea. Cold weather, moisture, and road salt wear down critical components. A spring maintenance routine at TrailersPlus helps catch small issues before they turn into costly repairs and ensures your trailer is safe and ready for steady use all year long.

Start with the Tires: Pressure, Wear, and Age

Tires are often the first thing to go overlooked, but they’re one of the most common causes of trailer failure. Begin by checking tire pressure and inflate according to the load range on the sidewall. Don’t rely on visual inspection—use a gauge. Look closely for uneven tread wear, sidewall cracks, or embedded debris. Dry rot is a common issue if the trailer has been sitting all winter. If tires are five years old or more, consider replacing them regardless of tread depth. Rubber breaks down with age, even in storage.

Inspect the Frame, Undercarriage, and Coupler

Road grime and salt can collect on the trailer frame and corrode structural components over time. Wash the undercarriage if needed and inspect the frame for rust, flaking paint, or signs of fatigue near welds or joints. Pay close attention to the tongue and coupler—look for cracked welds, bent hardware, and any movement or play in the latch mechanism. Make sure the coupler locks securely onto your hitch ball and that safety chains are intact and free of damage.

Check Brakes and Wiring Connections

If your trailer has brakes, test them before every season. Look for frayed wiring, worn connectors, or corrosion in the plug. Trailer wiring is especially vulnerable to moisture damage, and brake controllers won’t function properly if connections are weak or inconsistent. Make sure all lights—brake, tail, turn, and clearance—are working and not dim. Replace any damaged wiring or cracked housings, and clean all metal contact points with electrical grease or spray.

Test Your Wheel Bearings

Grease the wheel bearings if they haven’t been serviced in the last 12 months. Spin the wheels and listen for grinding or play. These are signs the bearings are worn and need replacement. Neglecting bearing maintenance is one of the fastest ways to damage a trailer that has been parked for a while. Also keep in mind the need to torque your lug nuts before hitting the road—especially if the trailer has been sitting through winter. Temperature changes and inactivity can cause them to loosen over time, increasing the risk of wheel separation.

Examine Doors, Seals, and Hinges

Doors that weren’t used often over winter may need some extra attention. Open and close all side and rear doors to make sure hinges swing smoothly and locks function correctly. Lubricate hinges, latches, and cam bars with light oil. Check door seals for cracks or gaps that could let in water or dust. Damaged seals should be replaced to protect the cargo area.

Look Over the Roof and Exterior Panels

Check the roof for any punctures, loose rivets, or areas where sealant may have failed. Spring is a good time to remove debris and re-seal joints if needed. Inspect exterior panels for dents, fastener movement, or corrosion, especially near wheel wells and trim. Make sure fenders are secure and not rubbing against tires.

Interior: Clean, Dry, and Functional

Sweep out the cargo area and check for signs of water intrusion, like rusted fasteners, stains, or soft flooring. If your trailer has interior lighting or a vent, confirm that everything works and the roof vent opens and closes properly. Any mold, odor, or rust inside the trailer could point to a leak or poor ventilation.

Final Step: Look at Registration and Safety Gear

Before getting back on the road, confirm that your registration, plates, and inspection (if required in your state) are up to date. Check that your breakaway battery is charged and functioning, and that any emergency gear—jack, spare tire, wheel chocks—is stored and ready.

Need Service or Parts? TrailersPlus Can Help

If your spring inspection turns up something that needs repair, TrailersPlus carries replacement parts and offers in-house service at over 80 locations nationwide. Whether it’s wiring, bearings, seals, or tires, our team can get your trailer back in working order. We also offer certified inspections if you’d rather leave the maintenance to trained technicians. Stop by your nearest TrailersPlus and keep your trailer road-ready all season long.