Verified
Missouri Trailer Brake Laws 2026: Rules by Trailer Type
Missouri is verified as trailer-type specific, not a simple universal threshold state. Missouri State Highway Patrol guidance says trailer brakes are required on trailers coupled by fifth wheel and kingpin and on trailers hauling hazardous materials with gross weight exceeding 3,000 lb. Because the official public-safety guide does not state a universal bumper-pull recreational-trailer threshold, the page should show a trailer-specific manual check rather than a fake numeric cutoff.
- Brake threshold
- No weight cutofftrailer-specific rule
- Breakaway switch
- Required
- Safety chains
- Required
- Towing speed
- Posted limits
- Double towing
- Not recorded
On this page7 sections
Quick answer: verified trailer-type rule
In Missouri, the verified source set does not show a simple universal numeric trailer brake threshold. The state is modeled as a verified trailer-type rule.
Missouri trailer equipment rules
Trailer brakes
verified trailer-type rule
- Applies when
- trailer-specific rule
- Source
- Verified
- Last checked
- 2026-07-13
Breakaway switch
Missouri State Highway Patrol guidance says trailer brakes shall apply automatically and promptly upon breakaway and maintain application for 15 minutes; verify the exact trailer category before relying on this summary.
- Applies when
- Trailer type and weight may matter
- Source
- Verified
- Last checked
- 2026-07-13
Safety chains
Every towed vehicle must be coupled by a safety chain, cable or equivalent device in addition to the primary coupling, of sufficient strength to control it if that coupling fails. It is waived where a center-locking ball sits over the rear axle, and for fifth-wheel connections, wreckers and farm implements.
- Applies when
- Conventional trailer couplings
- Source
- Mo. Rev. Stat. 307.170.6
- Last checked
- 2026-08-21
Speed / lane rule
No towing-specific speed limit; follow posted limits.
- Applies when
- Posted roads and vehicle combinations
- Source
- Mo. Rev. Stat. 304.010.2
- Last checked
- 2026-08-21
Double towing
Missouri combination-length and trailer-type rules need separate route verification before towing multiple trailers.
- Applies when
- Multiple-trailer combinations
- Source
- Verified
- Last checked
- 2026-07-13
Read against the linked sources on . Statutes change and enforcement varies by trailer type — confirm before you tow.
Check your setup
How Missouri compares with neighbouring states
None of the 8 states bordering Missouri set a stricter numeric brake threshold in this dataset, but bases and equipment rules still differ — check each state page before a trip.
| Bordering state | Brake threshold | Compared with Missouri |
|---|---|---|
| Arkansas | 3,000 lb gross weight | Different rule type — compare directly |
| Illinois | 3,000 lb gross weight | Different rule type — compare directly |
| Iowa | 3,000 lb gross weight | Different rule type — compare directly |
| Kansas | verified stopping-distance performance rule | Different rule type — compare directly |
| Kentucky | verified stopping-distance performance rule | Different rule type — compare directly |
| Nebraska | 3,000 lb gross weight | Different rule type — compare directly |
| Oklahoma | 3,000 lb gross weight | Different rule type — compare directly |
| Tennessee | 3,000 lb gross weight | Different rule type — compare directly |
Planning a multi-state trip? The route brake law checker compares every state on a route at once.
Official source links
- Missouri Revised Statutes 307.170 brakes statute
- Missouri State Highway Patrol trailer towing guide public-safety
- Missouri DOT dot
Missouri towing law FAQ
Are trailer brakes required in Missouri?
Missouri does not publish a simple universal numeric trailer brake threshold in the verified source set used here. The rule is handled as a verified trailer-type rule, so trailer type, stopping performance, equipment type, speed, or route condition may decide the answer.
What weight requires trailer brakes in Missouri?
Missouri is not modeled as a simple pound-threshold state. Use the official source links because this page verifies a verified trailer-type rule instead of a universal weight cutoff.
Is a breakaway switch required in Missouri?
Missouri State Highway Patrol guidance says trailer brakes shall apply automatically and promptly upon breakaway and maintain application for 15 minutes; verify the exact trailer category before relying on this summary.
Are safety chains required in Missouri?
Every towed vehicle must be coupled by a safety chain, cable or equivalent device in addition to the primary coupling, of sufficient strength to control it if that coupling fails. It is waived where a center-locking ball sits over the rear axle, and for fifth-wheel connections, wreckers and farm implements. (Mo. Rev. Stat. 307.170.6)
Can I tow two trailers in Missouri?
Missouri combination-length and trailer-type rules need separate route verification before towing multiple trailers.
Is there a towing speed limit in Missouri?
No towing-specific speed limit; follow posted limits. (Mo. Rev. Stat. 304.010.2)
Does Missouri measure trailer weight as GVWR or actual weight?
Missouri uses trailer-specific rule, so weigh the trailer as you actually tow it rather than reading the data plate.
Where can I verify Missouri towing laws?
Start with the 3 official sources linked on this page, beginning with Missouri Revised Statutes 307.170 brakes. Prefer state DOT, DMV, legislature, or public-safety pages over summaries from private websites. This page was last checked on 2026-07-13.
Disclaimer: educational summary, not legal advice. Statutes and enforcement practice change — verify the Missouri sources linked above before towing.