Trailer Maintenance Checklist

Regular maintenance is the single most important thing you can do to extend the life of your trailer and keep it safe on the road. Most trailer failures — blown tires, seized bearings, brake failures, and lighting problems — are preventable with routine inspection and service.

Before Every Trip

Take 5 minutes before every trip to check these items:

• Coupler and hitch ball — coupler fully latched and locked; safety pin or clip in place; ball size matches coupler rating
• Safety chains — crossed under the tongue and connected to the tow vehicle; enough slack to turn but not drag
• Breakaway cable — connected to the tow vehicle (not the hitch ball); cable not frayed or kinked
• Lights — brake lights, turn signals, running lights, and license plate light all functioning
• Tires — visually inspect for obvious damage, sidewall bulges, or low pressure; check pressure with a gauge if the trailer has been sitting
• Load security — cargo properly secured with straps, chains, or tie-downs; load balanced side-to-side and front-to-back
• Ramps and doors — ramps stowed and secured; doors latched and locked
• Brake controller — if your trailer has electric brakes, verify the brake controller is connected and functioning

Monthly Checks

For trailers used regularly, perform these checks monthly:

• Tire pressure — check cold pressure against the tire's maximum rating (not the tow vehicle's tire pressure); trailer tires are often rated higher than car tires
• Tire condition — look for uneven wear (may indicate alignment or bearing issues), cracking in the sidewalls, or embedded objects
• Wheel lug nuts — check torque; trailer lug nuts can loosen from vibration; re-torque to spec after the first 50 miles on new wheels and periodically thereafter
• Coupler and ball — inspect for wear; the coupler should not rattle on the ball; replace if worn
• Safety chains — inspect for wear, cracks, or damaged links; replace if any link is compromised
• Lights and wiring — check all lights; inspect the wiring harness for chafing, corrosion at connectors, or damage from road debris

Annual Service

At minimum, have your trailer professionally inspected once a year — or more frequently if you use it heavily. Annual service should include:

• Wheel bearing inspection, repacking, or replacement
• Brake inspection and adjustment (electric brakes) or actuator inspection (surge brakes)
• Brake magnet inspection and replacement if worn
• Tire rotation and replacement if tread is below safe limits
• Frame inspection for cracks, rust, or damage
• Coupler and hitch hardware inspection
• Breakaway battery test and replacement if needed
• Full lighting and wiring inspection
• Lubrication of all moving parts (hinges, ramp pivots, door latches)

In New York State, trailers with a GVWR over 1,000 lbs require an annual safety inspection. Our service department performs trailer inspections and can handle all of the above service items.

Wheel Bearings

Wheel bearing failure is the most common cause of trailer breakdowns and fires. Bearings that run dry or are contaminated with water will overheat, seize, and can cause the wheel to separate from the trailer at highway speed.

Signs of bearing problems include: a grinding or humming noise from the wheel area, excessive heat at the hub after a trip (hub should be warm, not hot to the touch), or wobbling of the wheel when jacked up.

Repack bearings annually for trailers used regularly, or every 12,000 miles — whichever comes first. Trailers that are submerged (boat trailers) should have bearings inspected and repacked more frequently, as water intrusion is common.

Consider upgrading to oil-bath hubs (also called "Bearing Buddy" style) if your trailer is used frequently or submerged. These keep bearings continuously lubricated and are easier to maintain.

Brakes

Electric trailer brakes wear similarly to vehicle brakes. Key maintenance items:

• Brake magnets — inspect annually; replace when worn to the wear indicator or if the surface is grooved
• Brake drums — inspect for scoring or cracks; resurface or replace as needed
• Brake shoes/pads — replace when worn below minimum thickness
• Brake controller adjustment — adjust the gain setting on your brake controller so the trailer brakes apply proportionally; too little gain means the trailer pushes the tow vehicle; too much causes wheel lockup
• Breakaway battery — test annually; replace every 2–3 years or when it fails to hold a charge

Tires

Trailer tires (ST-rated) are different from passenger car tires. They are designed for the specific load and speed requirements of trailer use. Key points:

• Never mix tire types — use ST-rated tires on trailers; passenger (P) or light truck (LT) tires are not designed for trailer use
• Check the age — trailer tires should be replaced every 5–7 years regardless of tread depth; UV exposure and ozone cause sidewall cracking that is not always visible
• Inflate to the tire's maximum rating — trailer tires are typically inflated to their maximum rated pressure, not the tow vehicle's tire pressure
• Don't exceed the speed rating — most ST tires are rated for 65 mph; some are rated for 75 mph; check the sidewall

Frame and Body

• Inspect the frame annually for cracks, especially at weld joints and around the coupler
• Touch up paint chips and scratches promptly to prevent rust (especially important in Central New York's salt-belt environment)
• Wash the underside of the trailer after winter use to remove road salt
• Lubricate ramp hinges, door hinges, and latch mechanisms seasonally
• Inspect the floor for soft spots, rot (wood floors), or cracks (aluminum floors)

When to Call a Professional

Some maintenance tasks are straightforward DIY work. Others require professional service:

• Brake adjustment and replacement — requires proper tools and knowledge of brake system specs
• Bearing replacement — requires proper bearing press tools and torque specs
• Frame welding or structural repairs — requires certified welding equipment and expertise
• Electrical diagnosis — trailer wiring problems can be complex; a professional can diagnose quickly
• Annual NYS inspection — must be performed by a licensed inspection station

Our service department at Patriot Trailer Solutions handles all of the above. Schedule a service appointment or call us at (833) 782-2746.