When you need trailer brakes
"These are required above a 2,000-lb. trailer weight on Silverado, Suburban and Tahoe, and above a 1,500-lb. trailer weight on all other models. (Brake requirements vary by state; consult state laws for actual requirements.)"
— 2025 Chevrolet Trailering Guide, p.6 (Trailer Brakes)
What you need
- RequiredClass 3 hitch (2 in receiver)
A 4,000 lb trailer needs a hitch rated at or above 4,000 lb gross trailer weight. Class 3 hardware is rated to 8,000 lb (typically) with 1,000 lb tongue weight. Ratings are set per part number — check the sticker on the hitch itself, and remember your vehicle's own tow rating still governs if it is lower.
Find it on Amazon →Affiliate link — as an Amazon Associate we earn from qualifying purchases, at no extra cost to you. - RequiredBall mount rated above 600 lb tongue weight
Your tongue weight lands in the 400–600 lb band (10–15% of 4,000 lb). Size the drop or rise so the trailer sits level when coupled — measure your receiver height and your coupler height first; a nose-high or nose-down trailer moves weight off the axles and starts sway.
Find it on Amazon →Affiliate link — as an Amazon Associate we earn from qualifying purchases, at no extra cost to you. - RequiredHitch ball — 2 in or 2-5/16 in
The ball must match the size stamped on your coupler exactly. Ball diameter MUST match the coupler size stamped on your trailer coupler. An undersized ball lets the trailer bounce loose. Capacity varies by part number. At 4,000 lb the sizes rated to carry it are 2 in or 2-5/16 in, but the coupler decides, not the weight. Full ball and coupler size chart →
Find it on Amazon →Affiliate link — as an Amazon Associate we earn from qualifying purchases, at no extra cost to you. - RequiredBrake controller (and a 7-pin connection)
Trailer brakes are required above 2,000 lb of trailer weight on full-size trucks and SUVs, and electric trailer brakes need a controller in the cab to operate them. Brake requirements vary by state — check your state's law, some set the threshold lower. Many recent trucks have an integrated controller already; check before you buy one.
Find it on Amazon →Affiliate link — as an Amazon Associate we earn from qualifying purchases, at no extra cost to you. - Required7-pin wiring harness / adapter
A 4-pin flat carries lights only. Electric trailer brakes and a charge line need the 7-pin round connector. Match the harness to your vehicle, not to the trailer.
Find it on Amazon →Affiliate link — as an Amazon Associate we earn from qualifying purchases, at no extra cost to you. - RequiredSafety chains rated for the trailer
Chains must be rated at or above 4,000 lb and cross under the tongue in an X, so the tongue is caught rather than dropped if the coupler releases.
Find it on Amazon →Affiliate link — as an Amazon Associate we earn from qualifying purchases, at no extra cost to you. - RecommendedHitch pin and lock
Keeps the ball mount in the receiver and makes it much harder to walk off with. Match the pin diameter to your receiver (2 in).
Find it on Amazon →Affiliate link — as an Amazon Associate we earn from qualifying purchases, at no extra cost to you. - RecommendedTowing mirrors
If the trailer is wider than your vehicle you must be able to see down both sides of it. Many states require it; all of them make it safer.
Find it on Amazon →Affiliate link — as an Amazon Associate we earn from qualifying purchases, at no extra cost to you. - RecommendedTongue weight scale
Tongue weight is the one number nobody publishes for you — it depends entirely on how you load the trailer. A scale is the only way to know you are inside 400–600 lb instead of guessing.
Find it on Amazon →Affiliate link — as an Amazon Associate we earn from qualifying purchases, at no extra cost to you.
Common questions
When are trailer brakes required?
Chevrolet publishes: required above 2,000 lb of trailer weight on Silverado, Suburban and Tahoe, and above 1,500 lb on all other models. Brake requirements also vary by state and some states set the threshold lower, so check your state's law as well.
Do I need a brake controller?
If the trailer has electric brakes, yes — the controller is what operates them from the cab. Many recent trucks have one integrated from the factory; check before buying. Surge brakes, common on boat trailers, are self-contained and need no controller.
What is the difference between 4-pin and 7-pin?
A 4-pin flat carries running lights, turn signals and brake lights only. A 7-pin round adds the electric brake line, a reverse line and a charge line. If the trailer has electric brakes you need the 7-pin.
Source: 2025 Chevrolet Trailering Guide, p.6 (Trailer Brakes) · last verified 2026-08-29