Profile: Soaring Trailer Parts Co., Ltd. specializes in providing trailer wheels, winches, and other hardware products. Heavy-duty coupler has a low-profile latch and hinged ball socket that offers a tight fit with visual indication of proper closure around the ball. Heavy-duty coupler is ideal for utility, livestock, cargo, and construction trailers. Our brake winch is plated with black powder. The capacity of our brake winch is based on the direct line pull on the third layer line drum.