If you have an over the rail tool box installed on your truck, you know that regular tonneau covers won’t fit. You don’t need to sacrifice protection to use your tool box though - specially compatible tool box tonneau covers are available, sized to work with your tool box! You can protect the cargo in your bed without sacrificing the usability of your tool box. Our covers are custom-fit to your specific year, make, and model, and work with most traditional toolboxes that occupy 20-21” of bed space. Alternatively, some come ready with custom under-tonneau or integrated tool boxes included. Still have questions? Call our product experts at (800) 874-8888 and we will help pick the right toolbox tonneau cover for you!