How to Select a Trailer Hitch
How hitch class ties to trailer weight and tongue weight before you buy a receiver.
Watch on YouTube →Trailer Tongue Weight Explained (Canada)
Tongue weight is the downward force the trailer coupler puts on your hitch ball. Get it wrong and the trailer either wanders or plants the rear of the tow vehicle. This page explains it in plain Canadian shopping language — what it is, why hitch class and vehicle ratings care, simple ways people check it, and the mistakes we see most often.
Written for Canadian shoppers. Free shipping on CURT towing gear from Lots of Parts.
Pair this with the
weight distribution guide,
ball mount guide, and
hitch buying guide.
Prefer the full index?
Open the towing guides hub.
Watch these CURT videos first
All four videos are from the official CURT YouTube channel (@curtmfg). Selection and ball-mount videos frame capacity; the weight-distribution video shows what happens when tongue weight needs help from spring bars.
If an embed does not load, use the YouTube link under the card.
Choose a Ball Mount
Ball mounts carry tongue weight too — match the mount rating to the load on the coupler.
Watch on YouTube →Set Up Weight Distribution
When tongue weight is heavy enough that the rear squats, weight distribution spreads load back onto the axles.
Watch on YouTube →CURT Install Techniques
A solid receiver install still matters — tongue weight only works if the hitch is seated and torqued right.
Watch on YouTube →What tongue weight actually is
Picture the trailer sitting on its jack with the coupler over the ball. The share of trailer weight that presses down through that coupler is tongue weight. For many conventional trailers, a healthy target lands around 10 to 15 percent of the loaded trailer weight. That is a rule of thumb, not a law — your trailer maker and tow-vehicle maker publish the numbers that count.
Too little tongue weight and the trailer can start to sway as speed builds. Too much and the rear of the truck or SUV squats, headlights aim at the sky, and steering feels light. Canadian highway speeds and crosswinds make that balance more important, not less.
Why hitch class and vehicle ratings care
Every CURT receiver card lists a weight-carrying tongue-weight number and, when applicable, a weight-distribution tongue-weight number. Your tow vehicle also has a maximum tongue-weight rating in the owner’s manual or door sticker. The safe limit is always the lowest of those numbers — hitch, ball mount, ball, vehicle, and trailer.
Hitch class is a shorthand for those capacities, not a free upgrade. A Class 3 receiver does not raise a compact SUV’s factory tow rating. Likewise, a Class 5 hitch on a heavy truck still has to respect tire, axle, and payload limits. Read more in the Class 3 versus Class 4 guide and the how to choose a hitch page.
| Situation | What usually matters |
|---|---|
| Light utility trailer | Often stays inside weight-carrying tongue limits on a Class 2 or Class 3 hitch — still verify the vehicle rating. |
| Mid-size travel trailer | Tongue weight climbs fast with water, batteries, and cargo up front. Many setups need weight distribution. |
| Compact truck or crossover | Tongue weight, not just total trailer weight, is what squats the rear. Stay conservative. |
| Winter and salt roads | Same tongue-weight math — plus slower speeds, longer stopping, and clean plugs. See the winter towing guide. |
Simple ways people check tongue weight
Most accurate
Scale methods
Commercial truck scales, some scrap yards, and dedicated tongue-weight scales give a real number with the trailer loaded the way you actually travel.
- Weigh with water, gear, and propane as you tow
- Re-check after you move cargo
Driveway reality
Bathroom-scale style
Some owners use a sturdy scale under a pipe or jack stand under the coupler. It can be close for lighter trailers when the setup is level and safe.
- Keep people clear of a falling jack
- Treat it as a check, not a lab measurement
If you cannot weigh, start with the trailer’s empty tongue-weight figure from the maker, then add a realistic guess for battery, propane, and gear stored forward of the axle. When the guess gets large, weigh it — guessing heavy cargo wrong is how sway starts.
Common mistakes
- Loading the back of the trailer heavy — coolers and generators behind the axle steal tongue weight and invite sway.
- Trusting hitch class alone — the vehicle tongue-weight rating can be lower than the hitch card.
- Ignoring the ball mount rating — the mount and ball are part of the chain. See the ball mount guide.
- Skipping weight distribution when the rear squats — spring bars are not decoration. Read the weight distribution guide.
- Mixing up gross trailer weight and tongue weight — a 5,000 lb trailer can still have a tongue that overloads a light SUV.
When weight distribution enters the chat
If the trailer is heavy enough that the tow vehicle squats or the owner’s manual calls for weight distribution, a WD hitch uses spring bars to push load back onto the front axle and the trailer axles. That does not create free capacity — it helps you use the ratings you already have more safely. CURT’s setup video above is the visual; the written deep-dive is the weight distribution guide.
Canada checklist
Step 1Find the limits
Vehicle manual, hitch card, ball mount, and trailer plate — write down the lowest tongue number.
Step 2Load like you travel
Water, propane, batteries, and gear forward of the axle change the number.
Step 3Weigh when you can
A scale trip beats a hopeful percentage on a busy highway.
Step 4Add WD if needed
Squat, light steering, or a manual that demands it — open the WD guide.
Related guides
Weight DistributionWhen spring bars help
Ball Mount GuideDrop, rise, ratings
Hitch Buying GuideClass basics
Sway ControlWhen the trailer wanders
Winter TowingCold-weather habits
Towing Guides HubAll guides
Shop Trailer Hitches
Browse CURT receivers with free shipping across Canada — then match tongue weight to the card.
Open trailer hitches →Also useful
Parts that share the tongue-weight load.
Ball mounts →Wiring →
Hitch accessories →
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More help: towing guides hub · how to choose a hitch · contact support
