[/ QUOTE ]
Better check Illinois, because obviously I'd post my own state.
Wisconsin requires brakes for ANY trailer, reguardless of weight.
[/ QUOTE ]
Wisconsin
Total length: 60’. A motor vehicle may be towed without being equipped with brakes if the *GVW of the towed vehicles not more than 40% of the *GVW of the towing vehicle and the towing vehicle has brakes adequate enough to stop the combination of vehicles. The drawbar or other connection between the 2 vehicles may not exceed 12’ in length. In addition to the hitch, every towed vehicle must be coupled to the towing vehicle by means of safety chains, leveling bars, or cables. The provision does not apply to a vehicle equipped with a 5th-wheel and kingpin assembly. 2,3
Illinois
Total length: 65’. Every trailer of a *GW of over 3,000lbs. must be equipped with brakes when operated upon a highway. Such brakes must be so designed and connected that in case of an accidental breakaway of a towed vehicle over 5,000lbs., the brakes are automatically applied. Drawbar or other connection shall be of sufficient strength to pull all the weight towed and shall not exceed 15’ in length. Outside a business, residential or suburban district, or highway, no vehicle shall be towed on a roadway except by a drawbar and each such vehicle so towed shall, in addition, be coupled with 2 safety chains or cables to the towing vehicle. Chains or cables shall be of sufficient size and strength to prevent towed vehicle parting from towing vehicle in case drawbar should break or become disengaged. Special permit required if combination exceed size limits. Brake hookup required if vehicle towed is over 3,000lbs.