I have a decked system in the truck I'm replacing, and My wife and I really like it. We can get most of the camping gear in it except clothes and daypacks. I use one drawer and the tailgate for cooking. We like it well enough that when we went shopping for a more capable and comfortable truck, we got one that we could move the Decked into. This isn't the best pic of my old truck but you can see the drawer open in "kitchen mode". There's a stove on the tailgate next to it, and my wife is getting food out of the cooler strapped to the top.
We also have a couple of the boxes that fit in it for organization, and the rails on the top to tie stuff too.