you can look into getting an angled tool box that tapers inward to allow for better clearance. There's a bit more you need to account for if you use (or plan to use) your pickup truck for towing ...

Built as a durable utility pickup for drivers seeking ... a 6.5-foot and 8-foot bed box was available. For 1998, the performance ante of the medium-sized pickup truck was raised by the presence of an ...