If your trailer’s Gross Vehicle Weight Rating (GVWR) exceeds 3000 pounds, it will need an annual inspection. To avoid the need for brakes and a yearly inspection, manufacturers purposefully rate most single-axle trailers at 2990 pounds, even though their axles are rated for 3500 pounds.  If you purchase a single-axle trailer equipped with brakes, you can opt for a GVWR of either 2990 or 3500 pounds. Trailers are inspected at most auto inspection facilities. Trailers that exceed a GVWR of 10,000 pounds must be inspected by a mechanic certified with “Code 3” credentials. Find a detailed description of the Pennsylvania trailer inspection code here.