TowWithin checks your vehicle's towing specs against your trailer's weight — across four safety metrics — and tells you instantly whether your setup is within limits or over capacity. Know before you hitch.
The problemMost people tow by feel, not by spec
Towing over capacity is one of the most common causes of trailer sway, brake failure, and loss of control. Vehicle tow ratings are buried in owner's manuals and vary by trim, engine, and axle package. Most drivers tow by feel, not by spec. TowWithin pulls the numbers together and gives you a clear answer.
What it does
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Vehicle Database
Search by year, make, model, and trim for factory tow ratings — GVWR, GCWR, payload, and tow capacity — sourced from manufacturer specs.
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4-Point Safety Check
Checks trailer GTW against tow capacity, tongue weight against payload, total combined weight against GCWR, and trailer weight against GVWR. Four checks, one clear result.
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Tongue Weight Calculator
Enter your trailer's gross weight and TowWithin estimates tongue weight at 12% — or override it with a scale reading.
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Save Vehicle + Trailer Profiles
Save your truck and trailer combination for instant recheck when load changes.
How it works
- 1
Select your vehicle
Search by year, make, and model. Pick your trim to get the exact factory ratings.
- 2
Enter trailer weight
Gross trailer weight (GTW) and tongue weight — or use the estimated 12% default.
- 3
See your safety status
Four-point result: tow capacity, payload, GCWR, GVWR — pass or fail on each, with exact margins.
Who it's for
- Truck and SUV owners buying or renting a new trailer
- RV owners verifying their tow vehicle can handle upgrades
- Contractors hauling equipment trailers on job sites
- Anyone who wants to know before they hitch, not after something goes wrong
Pricing
Unlimited checks. Full vehicle database (2000–2024). Save unlimited profiles. No subscription. All sales final; refund requests subject to Google Play policy.
Available on Google PlayQuestions
Does the app require an internet connection?
No. All calculations run on-device using embedded data. No network required after install.
Is my data shared with anyone?
No. TowWithin does not collect, transmit, or store any personal data externally. Everything stays on your device.
How often is the data updated?
Vehicle specs cover model years 2000–2024. App updates deliver new datasets without requiring a new purchase.
Can I use it for commercial purposes?
Yes. It's commonly used by contractors and professional drivers. The one-time price covers all use cases.
- One-time purchase — no subscription
- No account required
- No data collected — runs on-device
- Built for Android, iOS coming
QuassLabs Foundry builds utility apps for people who work in the field — truckers, boaters, tow-vehicle owners, and outdoor professionals. No subscriptions, no data collection, no accounts required. Buy once, own it.
All Foundry apps run fully on-device. Your data never leaves your phone. Contact: taylor@quass.org
TowWithin provides towing safety estimates for informational purposes only. Towing capacity varies by configuration, condition, and terrain. Always consult your vehicle owner's manual and follow manufacturer guidelines. QuassLabs is not liable for accidents, damages, or equipment failure resulting from use of this app. See our Terms and Privacy Policy.