That’s lots of room to work with. What is your plan for accessibility within the canopy? Side storage and middle drawers? Bedslide? Truck monkey? Lithe, spry young girlfriend?
Step ladder for now. Without leaning in too much. From the driver side, I placed my wallet so my fingers cover it. From the passenger side this is my reach. Anything larger than a shoebox with a decent handle should be grabable from at least one side.