If the rust spots are evenly spaced, you can use surface stitches to cover them. Good stitches might be Smyrna cross stitch, satin-stitch heart, queen stitch, satin stitch lozenges/triangles, palestrina knots, etc. If the spots are not evenly spaced, balance the design by adding extra stitches between the spots.
Fortunately, most states require drivers to equip their trailers with brakes and devices known as brake controllers. When a driver presses on the brake pedal in his truck, the brake controller lets the trailer's brake system know how much braking power is needed to stop the trailer.
There is a valve in the brake line of each brake controlled by the ABS. 1  On some systems, the valve has three positions: 2  In position one, the valve is open; pressure from the master cylinder is passed right through to the brake. 3  In position two, the valve blocks the line, isolating that brake from the master cylinder.