Quick Answer Your boat trailer carries the same value as your motor and your boat combined. Skip annual maintenance and you find out the hard way at the worst possible moment, usually mid-launch on a Saturday morning in May. - Bearings: repack annually OR every 12,000 km;...
Quick Answer
Your boat trailer carries the same value as your motor and your boat combined. Skip annual maintenance and you find out the hard way at the worst possible moment, usually mid-launch on a Saturday morning in May.
- Bearings: repack annually OR every 12,000 km; replace at the first sign of grease colour change or play
- Brakes: annual flush + pad inspection; surge or electric, both fail the same way
- Tires: check pressure cold every trip; replace every 5-6 years even if tread looks fine (rubber degrades faster than tread wears)
- Lights/wiring: test before every trip; sealed LED tail lights last 10x longer than standard
- Bunks/rollers: carpet bunks every 4-5 years; rusted bunk brackets are the #1 trailer failure HBW sees
Trailer maintenance budget
What annual trailer service actually costs in Ontario
Most trailer problems come from skipped maintenance. Here are the real Ontario shop costs for the 5 things you should be doing once a year on a boat trailer.
Wheel bearing repack$60 - $120 per axle
Pull, clean, inspect, re-grease both bearings per hub. Single axle is one wheel side per side. Tandem is double. Most-skipped service we see on used trailers.
Bearing buddy or oil-bath inspection$20 - $40
If your trailer has bearing buddies, top off grease. If it has oil-bath hubs (heavier-duty trailers), check sight glass and oil colour. Milky oil means water intrusion, replace immediately.
Tire replacement$120 - $250 per tire
Trailer tires age out before they wear out. 5-year rule of thumb in Ontario sun. Look for sidewall cracking. ST-rated marine tires only, not passenger.
Brake service (if equipped)$150 - $400 per axle
Surge or electric brake systems on heavier trailers need annual inspection. Submerging brakes in lake water shortens life. Most aluminum-fishing-boat trailers don't have brakes; bigger fiberglass and pontoon trailers do.
Lights + wiring + winch strap$30 - $150
LED bulb replacements, ground wire inspection, winch strap replacement if frayed. Cheap insurance that keeps you legal on the highway.
Typical annual all-in (single axle, no brakes)$150 - $350 / year
Tandem trailers, braked trailers, and corroded older units cost more. Aluminum trailers in Rice Lake fresh water hold up better than steel in salt-treated road conditions. Book trailer service at /service.
Why Most Boaters Skip Trailer Maintenance Until It Fails
Trailers are easy to ignore. They sit in the driveway most of the year, get pulled out twice for launch and haul-out, and seem fine when they are not. But the trailer is the only thing between your $20,000+ boat-and-motor combo and the asphalt at highway speed.
We see three patterns at HBW:
- The bearing burn-out. Boat owner trailers a 3-hour drive to a tournament. Hub heats up, bearing seizes, wheel locks, boat drags 200 metres before they can stop. Insurance covers some of it but not the holiday.
- The brake fade. Surge brakes on a loaded trailer have not been serviced in 5 years. Coming down a hill into a launch ramp, the brakes do not grab. Truck and trailer slide into the lake.
- The tire blow-out. Trailer tires look fine but were manufactured 8 years ago. UV and ozone degraded the rubber from the inside. 80 km/h on the 401 in July, tire shreds, trailer tracks into the ditch.
All three are preventable with a 30-minute annual inspection.
The 6 Things to Check Every Spring
1. Wheel Bearings (Most Common Failure Point)
Bearings are sealed grease cartridges that let the wheels spin freely. Submerging hot bearings in cold lake water creates a vacuum that pulls water into the hub. Once water mixes with grease, corrosion starts immediately.
Action:
- Repack annually (Bearing Buddies make this easy)
- Replace bearings outright every 4-5 years regardless of appearance
- Check play with the wheel jacked up, any wiggle means bearings or races are worn
Cost at HBW: $80-$120 per axle for repack, $250-$350 for full bearing replacement including parts.
2. Brakes (Surge or Electric)
Most Ontario trailers under 2,500 lbs gross use surge brakes, the trailer's inertia compresses a hydraulic master cylinder when you brake. Larger trailers use electric brakes controlled from the tow vehicle.
Action:
- Surge: flush the hydraulic line annually with marine-grade brake fluid (DOT 4 or DOT 5)
- Electric: test the magnet's grab strength annually; replace pads when worn
- Inspect rotors/drums for rust pitting
Cost at HBW: $150-$250 for surge brake service; $200-$300 for electric brake service.
3. Tires and Pressure
Boat trailer tires (ST-rated) are different from car tires. They have stiffer sidewalls but degrade faster from UV and ozone exposure. The tread can look perfect at 8 years old while the sidewall is structurally compromised.
Action:
- Check cold tire pressure before every trip (target 50-65 PSI depending on size, match the sidewall spec)
- Replace tires every 5-6 years regardless of tread depth
- Carry a full-size spare, not a "donut"
- Check the DOT date code (last 4 digits = week/year of manufacture)
4. Lights and Wiring
Trailer lights fail because connectors corrode and constant flexing breaks the wiring inside the harness.
Action:
- Sealed LED lights with a single connector last 10x longer than standard bulbs
- Apply dielectric grease to the 4- or 7-pin connector every spring
- Test every trip, a $10 plug-in tester saves you from a $250 OPP ticket
5. Bunks, Rollers, and Frame
The bunks (the carpeted boards your hull rests on) and the rollers degrade slowly until you notice your boat sitting unevenly on the trailer.
Action:
- Replace carpet on bunks every 4-5 years (worn carpet means direct wood-on-hull contact)
- Rusted bunk brackets are the #1 trailer failure HBW sees, rinse the trailer after each dip
- Inspect the frame for cracks at weld points, especially the cross members
6. Winch, Straps, and Safety Chains
The cheapest items on the trailer are usually the most ignored.
Action:
- Lubricate winch gears annually
- Replace winch strap when fraying appears (Ontario sun degrades polyester within 5 years)
- Inspect safety chains for cracked links, replace at any sign of corrosion
Ontario-Specific Considerations
Road Salt
Ontario uses calcium chloride and sodium chloride on highways from November through April. Even if you do not trailer during salt season, residual salt on the road from before your first spring trip eats into trailer frames within months.
Action: Rinse the trailer thoroughly after the first 2-3 spring trips. A garden hose with a sprayer attachment for 5 minutes does the job.
Gravel Launch Ramps
Many Rice Lake and Kawartha launches have gravel or compacted-dirt access roads. The grit gets into bearings and lights faster than paved ramps. Plan for more frequent bearing maintenance if you launch off gravel weekly.
401 Highway Speeds
Ontario's 100 km/h posted limit means most boaters trailer at 110+ km/h actual. That is at the upper edge of most ST-rated trailer tires' rated speed (typically 105 km/h or 65 mph). Heavy loads + summer heat + actual highway speeds = more frequent tire replacements.
When to Bring Your Trailer to HBW
We service trailers we sell and most major brands. Common reasons customers bring trailers in:
- Annual bearing repack — fastest service item, usually done while you wait
- Brake conversion or upgrade — surge to electric, or rusted-out brake replacement
- Frame repair — welding cracked cross members or replacing tongue extensions
- Bunk replacement — full carpet and bracket refresh
- Pre-purchase inspection — buying a used boat-and-trailer combo, get the trailer inspected before the deal closes
Book at hbw.wiki/service or call (905) 342-2153.
When to Replace vs Repair
Trailer frames are weldable. Bunks, rollers, lights, and brakes are all replaceable parts. A 15-year-old trailer with a solid frame is usually worth refurbishing if the underlying structure is sound. Once the frame is cracked through, structurally compromised, or seriously rotted, replacement is the only safe option.
A new mid-size aluminum trailer for a 16-18 ft boat runs $3,000-$5,000 CAD in Ontario. A full refurbishment (bunks, bearings, brakes, lights, tires) on a sound frame is usually $800-$1,500. Math the lifespan honestly.
Last reviewed: 2026-05-13
By Harris Boat Works, Mercury Platinum Dealer, family marina since 1947 on Rice Lake.