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Last updated: September 2026
The right trailer accessories make towing safer and easier, and they make your trailer harder to steal. This guide is a checklist of the gear most trailer owners end up needing: a coupler lock, wheel chocks, safety chains, bearing protectors, a spare tire and carrier, a tongue weight scale and working lights. It also links to our detailed guides on jacks, wiring, hitches and tool boxes.
How we chose: this checklist uses the size, fit and rating details stated in each Amazon listing title. We haven’t hands-on tested these products. Match every part to your trailer’s coupler size, bolt pattern, tire size and weight ratings.
Trailer Accessories Checklist
| Accessory | Why you need it | Our guide / pick |
|---|---|---|
| Trailer jack | Raise and lower the tongue | Trailer jack guide |
| Wiring harness | Working lights and brakes | Trailer wiring harness guide |
| Hitch and ball | The connection itself | Trailer hitch · hitch balls |
| Coupler lock | Stops theft while parked | Proven Industries 2178, Master Lock |
| Wheel chocks | Stops rolling when unhitched | Rhino USA, MaxxHaul |
| Safety chains | Backup if the coupler lets go | G80 5/16″ chains |
| Bearing protectors | Keep hub bearings greased | Bearing Buddy 1980A |
| Spare tire + carrier | Trailer tires fail on the road | MaxxHaul 50214, ST205/75R15 tires |
| Tongue weight scale | Check tongue weight before loading up | Sherline 5781 |
| LED lights | Replace dim or broken lights | Partsam submersible kit |
| Tongue box | Store chains, straps and tools | Trailer tool box guide |
Trailer Security: Coupler Locks
A coupler lock blocks the coupler so a thief can’t drop it onto a ball and drive off. Match the lock to your coupler size: 1-7/8″, 2″ or 2-5/16″.
Proven Industries Model 2178 Trailer Lock (2″ Couplers, Made in USA)
A heavy-duty coupler lock for 2″ couplers, made in the USA per the listing.
- HEAVY-DUTY TRAILER LOCK: It’s important to do everything you can to protect your belongings and your trailer or camper f…
- TOUGH LOCK: The locking parts on this device are constructed from hardened steel for increased security, and the exterio…
- UNIQUE KEY DESIGN: Our trailer lock has a special key design that prevents anyone from picking the lock. This innovative…
Master Lock Trailer Lock (1-7/8″, 2″ and 2-5/16″)
One lock that the listing says fits three coupler sizes. That’s handy if you own more than one trailer.
- Coupler Lock,Universal
- Bright red finish discourages thief’s from messing with your trailer
- Advanced locking mechanism resists picking and prying
For the hitch side, see our hitch lock guide.
Wheel Chocks
Chock the trailer wheels before you unhitch, every time, especially on a slope.
Rhino USA Heavy-Duty Rubber Wheel Chocks
- Secure Your Vehicle with Confidence: Keep your RV, truck, or trailer safely in place with our high-quality RV tire chock…
- Enhanced Visibility in Low Light: Equipped with integrated reflective stripping for improved visibility during nighttime…
- Easy to Use with High-Vis Neon Green Rope: Each wheel chock for RV trailer comes with a high-visibility neon green rope,…
MaxxHaul Solid Rubber Wheel Chock 2-Pack (8 x 4 x 6″)
- Heavy-Duty Solid Rubber Construction: Premium-grade molded rubber resists cracking, crushing, deformation, and weather d…
- Compact 8″ x 4″ x 6″ Size: Space-efficient dimensions fit easily behind tires or inside storage compartments for cars, t…
- All-Weather, Oil-Resistant Performance: Engineered to withstand rain, snow, UV exposure, and oily surfaces for dependabl…
Safety Chains
Chains are required on most trailers. Cross them under the coupler so they can catch the tongue if it drops. Keep them rated for your trailer’s weight and long enough for full turns, without dragging.
G80 5/16″ x 36″ Trailer Safety Chains With Hooks (2-Pack)
- 💪[HIGH STRENGTH GRADE] – Those G80 heavy duty trailer safety chains use higher level alloy steel and forging process. Ca…
- 💪[EXCELLENT TENSILE STRENGTH] – The tow chains of heavy duty have a working load of up to 4900 lbs and 17000 lbs Break S…
- 💪[EXCELLENT STRUCTURE] – Trailer safety chains with Hooks 5/16″ × 36″ long heavy duty, each safety chain is equipped wit…
Wheel Bearings
Trailer hubs sit in water on boat launches and go unused for months, which is hard on bearings. Bearing protectors keep the grease under light pressure to help keep water out.
Bearing Buddy Model 1980A (Chrome, With 19B Bra)
Model 1980 fits hubs with a 1.980″ cap diameter. Measure your hub before ordering.
- PROTECT YOUR INVESTMENT – Whether it’s a boat, camper, or utility trailer, our Bearing Buddy prevents wheel bearing fail…
- EASY MONITORING – The blue visual grease indicator shows when your hub is properly filled with grease. When full, it ext…
- KEEPS GREASE IN & WATER OUT – Bearing Buddy has a spring-loaded piston that keeps a steady 3 psi of pressure inside your…
Spare Tire and Carrier
Trailer tires are a common cause of roadside breakdowns. Carry a mounted spare that matches your tire size, load range and bolt pattern.
MaxxHaul 50214 Spare Tire Carrier (4 on 4″ and 5 on 4-1/2″)
Holds 4-lug (4 on 4″) and 5-lug (5 on 4-1/2″) trailer wheels, per the listing. Check your bolt pattern.
- Holds 4-lug (4 on 4″ bolt pattern) and 5-lug (5 on 4-1/2″ bolt pattern) trailer wheels and not compatible with 5 on 4-3/…
- Mounts on trailer tongues up to 3 inch wide and 5 inch high
- Angled and raised mount design makes this ideal for boat trailers as well
Free Country ST205/75R15 Trailer Tires (Load Range D, Pair)
“ST” means a Special Trailer tire. Don’t use passenger-car tires on a trailer. Match the size and load range to your trailer’s placard.
- 2 new premium full nylon cap ply 8PR ST205/75R15 Radial trailer tires, brand: FREE COUNTRY
- Full nylon cap ply ( nylon overlay cross entire tread area), significant upgrade from most other products on the market …
- Featured “Scuff Guard” ring on tire wall for better tire side protection
Tongue Weight Scale
Too little tongue weight causes sway, and too much overloads your hitch and rear axle. A common rule of thumb is about 10-15% of the loaded trailer weight.
Sherline Hydraulic Tongue Weight Scale (5781)
Reads 0-5,000 lb, per the listing. Use it to set up your load and weight distribution hitch. See our weight distribution hitch guide.
- LM-5000 Trailer tongue weight scale displays both 0-5000 Lb and 0-2250 Kg.
Trailer Lights
Partsam Submersible LED Trailer Tail Light Kit With 25 ft Harness
A complete submersible LED kit with side markers and a 25 ft harness, per the listing. It’s a good fit for boat trailers that get dunked.
- [Upgraded LED Trailer Tail Light Kit] Package included: 2x square led trailer tail lights, 1x 12″ trailer light bar, 6 a…
- [Specifications] LED Quantity: square trailer lights=19 LEDs (left side), 15 LEDs (right side), trailer light bar=15-283…
- [Wiring Tips] square trailer lights: white wire=ground, yellow/green wire=high brightness, grown wire=low brightness; tr…
Pre-Trip Trailer Checklist
- Coupler latched and pinned, with the ball size matching the coupler.
- Safety chains crossed and attached, and the breakaway cable attached if you have electric brakes.
- Lights tested: tail, brake, turn and markers.
- Tire pressure checked cold against the trailer placard or tire sidewall, and lug nuts torqued.
- Jack fully raised, and chocks removed and stowed.
Need to secure the load? See our tow straps and ratchet straps guides.
Frequently Asked Questions
What accessories do I need for a new trailer?
At minimum: a coupler lock, wheel chocks, correctly rated safety chains, working lights and a spare tire. Add a jack, bearing protectors and a tongue weight scale as you tow more.
What size coupler lock do I need?
Match your coupler’s ball size, usually 1-7/8″, 2″ or 2-5/16″. It’s stamped on most couplers.
Are Bearing Buddies worth it?
For boat trailers and trailers that sit for long periods, bearing protectors help keep grease in and water out. Measure your hub so you get the right size.
Can I use car tires on a trailer?
No. Use ST (Special Trailer) tires rated for your trailer’s load, as shown on its placard.
How do I measure tongue weight?
Use a tongue weight scale under the coupler with the trailer loaded as you’ll tow it. Aim for roughly 10-15% of the total trailer weight.
The Bottom Line
Start with security and safety: a coupler lock, chocks, rated chains and working lights. Then add the gear that prevents breakdowns: a spare tire and carrier, and bearing protectors. Use the linked guides for jacks, wiring and tool boxes, and check the fit and current price on each listing above before you buy.
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