Custom Welded Aluminum Dog Boxes by High Speed Welding. Their custom aluminum dog boxes are fabricated with 1? square tubing. The tops of the dog boxes are 1/8 diamond plate. Ryder Racks dog boxes are custom built to order so we can make them however you want. They can be built with 1 door or 2 doors with a center divider. Fold-down ankle savers, top rails, and covered sides are popular additions.