I just use the cheap-o ones. Last year I had some $15 spider web looking thing I picked up from Autozone. I replaced it at the beginning of summer with some cheap thing my wife picked up at a local oddball store. Both are essentially interwoven bungee cords. When I carry a lot of stuff, including little items, I like to put a tarp over everything then the net over the tarp. Works great for camping - keeps some of the dirt and crap off my gear, plus gives me a tarp to use while camping. I had considered a tonneau cover, but for things like camping I end up stuff stacked higher than the bed (H3T beds are pretty small), so a tonneau cover wouldn't work anyway. A slant back top would be better, but $3k+ vs $15...
I do have 3 different Hummer brand truck boxes, a small one that fits on any rail, the large one that goes behind the cab, and a long one that goes down one side. The long down-the-side one is on a shelf in the garage right now because you can't fit both large boxes at the same time. This keeps the smallish items securely out of the weather and gives me a place for tow straps and tools and such.
I could use another pair or two of the sliding rail mounts though, that would be handy.