South Carolina Trailer Brake Laws: Required Over 3,000 lb
South Carolina code exempts trailers not exceeding 3,000 lb only when the trailer wheel weight is no more than 40% of the towing vehicle gross weight and the combination meets brake-performance requirements.
Quick answer: 3,000 lb gross weight
In South Carolina, trailer brakes are currently listed at 3,000 lb (gross weight). South Carolina measures gross weight, so weigh the trailer as you actually tow it.
| Requirement | State rule | Applies when | Source | Last checked |
|---|---|---|---|---|
| Trailer brakes | 3,000 lb | gross weight | Verified | 2026-07-13 |
| Breakaway switch | Every trailer with air or vacuum brakes, and every one over 3,000 lb gross weight, must have brakes on all wheels that apply automatically and promptly and stay applied at least 15 minutes on breakaway. | Trailer type and weight may matter | S.C. Code 56-5-4850(d), (e) | 2026-07-13 |
| Safety chains | A towing vehicle must be attached to the towed vehicle by a safety chain, cable or equivalent device in addition to the regular drawbar, tongue or hitch, strong enough to maintain the connection under all conditions. Fifth-wheel and kingpin hitches are exempt. | Conventional trailer couplings | S.C. Code 56-5-5150 | 2026-07-13 |
| Speed / lane rule | Manufactured, modular or mobile homes must not be transported faster than 10 mph below the posted limit where that limit exceeds 45 mph, and never over 55 mph. Other trailers follow the general posted limits. | Posted roads and vehicle combinations | S.C. Code 56-5-1520(B)(4) | 2026-07-13 |
| Double towing | Needs separate verification with South Carolina Code of Laws for non-farm multiple-trailer combinations. | Multiple-trailer combinations | Verified | 2026-07-13 |
Official source links
South Carolina code exempts trailers not exceeding 3,000 lb only when the trailer wheel weight is no more than 40% of the towing vehicle gross weight and the combination meets brake-performance requirements.
How the 3,000 lb threshold applies to three trailers
South Carolina 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 Carolina threshold by 1,350 lb |
| Loaded just under the line | 2,900 lb | Inside the South Carolina limit, but one heavy load away from crossing it |
| Mid-size travel trailer | 4,800 lb | Over the South Carolina threshold by 1,800 lb â brakes required |
South Carolina trailer equipment rules
Safety chains
RequiredA towing vehicle must be attached to the towed vehicle by a safety chain, cable or equivalent device in addition to the regular drawbar, tongue or hitch, strong enough to maintain the connection under all conditions. Fifth-wheel and kingpin hitches are exempt.
S.C. Code 56-5-5150 âBreakaway system
RequiredEvery trailer with air or vacuum brakes, and every one over 3,000 lb gross weight, must have brakes on all wheels that apply automatically and promptly and stay applied at least 15 minutes on breakaway.
S.C. Code 56-5-4850(d), (e) âSpeed limit when towing
Manufactured, modular or mobile homes must not be transported faster than 10 mph below the posted limit where that limit exceeds 45 mph, and never over 55 mph. Other trailers follow the general posted limits.
S.C. Code 56-5-1520(B)(4) âRead against the linked sources on . Statutes change and enforcement varies by trailer type â confirm before you tow.
Towing more than one trailer in South Carolina
Needs separate verification with South Carolina Code of Laws for non-farm multiple-trailer combinations.
Speed and lane rules when towing in South Carolina
No special recreational towing speed rule verified in the brake-source set; follow posted limits and trailer tire ratings.
How South Carolina compares with neighbouring states
None of the 2 states bordering South Carolina set a stricter numeric brake threshold in this dataset, but bases and equipment rules still differ â check each state page before a trip.
| Bordering state | Brake threshold | Compared with South Carolina |
|---|---|---|
| Georgia | 3,000 lb gross weight | Same threshold |
| North Carolina | 4,000 lb gross weight | 1,000 lb more permissive |
Planning a multi-state trip? The route brake law checker compares every state on a route at once.
Related towing tools
South Carolina towing law FAQ
Are trailer brakes required in South Carolina?
South Carolina 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 Carolina?
The current data lists 3,000 lb gross weight as the brake threshold.
Is a breakaway switch required in South Carolina?
Every trailer with air or vacuum brakes, and every one over 3,000 lb gross weight, must have brakes on all wheels that apply automatically and promptly and stay applied at least 15 minutes on breakaway. (S.C. Code 56-5-4850(d), (e))
Are safety chains required in South Carolina?
A towing vehicle must be attached to the towed vehicle by a safety chain, cable or equivalent device in addition to the regular drawbar, tongue or hitch, strong enough to maintain the connection under all conditions. Fifth-wheel and kingpin hitches are exempt. (S.C. Code 56-5-5150)
Can I tow two trailers in South Carolina?
Needs separate verification with South Carolina Code of Laws for non-farm multiple-trailer combinations.
Is there a towing speed limit in South Carolina?
Manufactured, modular or mobile homes must not be transported faster than 10 mph below the posted limit where that limit exceeds 45 mph, and never over 55 mph. Other trailers follow the general posted limits. (S.C. Code 56-5-1520(B)(4))
Does South Carolina measure trailer weight as GVWR or actual weight?
South Carolina uses gross weight, so weigh the trailer as you actually tow it rather than reading the data plate.
Where can I verify South Carolina towing laws?
Start with the 3 official sources linked on this page, beginning with South Carolina Code Sections 56-5-4850 to 56-5-4860. Prefer state DOT, DMV, legislature, or public-safety pages over summaries from private websites. This page was last checked on 2026-07-13.