A-Frame trailer toolboxes & storage boxes designed to be mounted on top of or inside the tongue of the trailer. A-Frame Trailer Boxes are heavy duty, high capacity and offer easy access to your equipment. Boxes can be mounted on A-frame trailer or many other applications. These boxes are perfect for storing your equipment, tools and personal gear. A-frame boxes are available in different sizes, and can be ordered custom size. All AMERICAN TRUCKBOXES boxes are designed and built to keep your equipment safe and secure.