Abstract: A towing vehicle having power-driven entered rear drive wheels. A towed attachment frame with lateral trailing wheels is coupled to the towing vehicle. A continuous belt on each side of the vehicle is trained over a drive wheel and a trailing wheel. A row of cleat structures is secured to the outer surface of a belt. A cleat structure includes a central expanse and elongate extension sections extending outwardly from opposite ends of a central section. Extension sections protrude beyond opposite lateral margins of a belt. A cleat structure includes an element plastic clear body, and spline elements secured by fasteners to a belt clamp against shoulders in a cleat body to hold it in place.