Verified
South Dakota Trailer Brake Laws 2026: Required Over 3,000 lb
South Dakota Codified Law Chapter 32-18 verifies the brake chapter, wheel-brake exceptions, and breakaway-related sections. The official site is JavaScript-rendered, so accessible section mirrors are retained for reader confirmation.
- Brake threshold
- 3,000lbgross weight
- Breakaway switch
- Required
- Safety chains
- Required
- Towing speed
- Posted limits
- Double towing
- Not recorded
On this page8 sections
Quick answer: 3,000 lb gross weight
In South Dakota, trailer brakes are currently listed at 3,000 lb (gross weight). South Dakota measures gross weight, so weigh the trailer as you actually tow it.
South Dakota trailer equipment rules
Breakaway switch
Every trailer with air or vacuum actuated brakes, and every one over 3,000 lb gross weight manufactured after July 1 1967, must have brakes on all wheels that apply automatically and promptly and remain applied at least 15 minutes upon breakaway.
- Applies when
- Trailer type and weight may matter
- Source
- SDCL 32-18-17
- Last checked
- 2026-08-21
Safety chains
Every trailer towed faster than 20 mph must be coupled by safety chains, cables or equivalent devices in addition to the regular hitch, connected to the drawbar to keep it off the ground if the drawbar fails. Fifth-wheel semitrailers and pole, pipe, log or piling dollies are exempt.
- Applies when
- Conventional trailer couplings
- Source
- SDCL 32-19-9; 32-19-10
- Last checked
- 2026-08-21
Speed / lane rule
No towing-specific limit for ordinary trailers (65 mph general, 80 mph interstate). A vehicle towing a manufactured or mobile home wider than 102 inches may not exceed 55 mph on interstates or 45 mph on any other highway.
- Applies when
- Posted roads and vehicle combinations
- Last checked
- 2026-08-21
Double towing
Needs verification with South Dakota law.
- 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 the 3,000 lb threshold applies to three trailers
South Dakota measures gross weight, so the weight of the trailer as loaded is what counts.
| Example trailer | Weight checked | Against 3,000 lb |
|---|---|---|
| Small utility trailer | 1,650 lb | Under the South Dakota threshold by 1,350 lb |
| Loaded just under the line | 2,900 lb | Inside the South Dakota limit, but one heavy load away from crossing it |
| Mid-size travel trailer | 4,800 lb | Over the South Dakota threshold by 1,800 lb — brakes required |
How South Dakota compares with neighbouring states
None of the 6 states bordering South Dakota 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 South Dakota |
|---|---|---|
| Iowa | 3,000 lb gross weight | Same threshold |
| Minnesota | 3,000 lb gross weight | Same threshold |
| Montana | 3,000 lb gross weight | Same threshold |
| Nebraska | 3,000 lb gross weight | Same threshold |
| North Dakota | verified trailer-type rule | Different rule type — compare directly |
| Wyoming | verified stopping-distance performance rule | 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
South Dakota towing law FAQ
Are trailer brakes required in South Dakota?
South Dakota currently lists a trailer brake threshold at 3,000 lb gross weight. Always verify the official state source before towing.
What weight requires trailer brakes in South Dakota?
The current data lists 3,000 lb gross weight as the brake threshold.
Is a breakaway switch required in South Dakota?
Every trailer with air or vacuum actuated brakes, and every one over 3,000 lb gross weight manufactured after July 1 1967, must have brakes on all wheels that apply automatically and promptly and remain applied at least 15 minutes upon breakaway. (SDCL 32-18-17)
Are safety chains required in South Dakota?
Every trailer towed faster than 20 mph must be coupled by safety chains, cables or equivalent devices in addition to the regular hitch, connected to the drawbar to keep it off the ground if the drawbar fails. Fifth-wheel semitrailers and pole, pipe, log or piling dollies are exempt. (SDCL 32-19-9; 32-19-10)
Can I tow two trailers in South Dakota?
Needs verification with South Dakota law.
Is there a towing speed limit in South Dakota?
No towing-specific limit for ordinary trailers (65 mph general, 80 mph interstate). A vehicle towing a manufactured or mobile home wider than 102 inches may not exceed 55 mph on interstates or 45 mph on any other highway. (SDCL 32-25-1.1; 32-25-4; 32-25-6.1)
Does South Dakota measure trailer weight as GVWR or actual weight?
South Dakota uses gross weight, so weigh the trailer as you actually tow it rather than reading the data plate.
Where can I verify South Dakota towing laws?
Start with the 3 official sources linked on this page, beginning with South Dakota Codified Law Chapter 32-18. 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 South Dakota sources linked above before towing.