While at SEMA 2017 I spotted this amazing cargo box on a slide out system for trucks and vans. This thing slides out incredibly far transforming your truck into a "command center".
For marksmen, it can hold all your firearms, ammo, targets and support gear.
If you are a tradesman you can clearly see the possibilities. I especially like the roof top cargo rack that slides over to the side and down so you don't need to climb into your truck bed to access your gear. CargoGlide also makes slide out racks for vans and other pickups.