Clearance over bed rails enough for a toolbox

I'm thinking the toolbox would only present a possible problem when turned fairly sharply on uneven terrain at the same time, which probably is an unlikely occurrence. That said, I have an approx 6 1/2 ft bed and my automatic slider sure has paid off. On the other hand, where I pull into my driveway and also when I pull into the backyard, there are elevation changes and my bed and camper almost meet. It's kind of tenuous every time and certainly if I had a toolbox it would be hitting because there is some fairly tight turning involved, but my situation is a little unique.