The shocks by themselves will only get you so far. While a good set of gas shocks will help, as mentioned above it's usually the springs combined with a good set of properly valved shocks that really make the difference. If you put a set of squishy shocks on top of inherently bouncy 40 springs you'll end up with a truck that handles poorly and returns only a moderate difference in ride quality.
I've messed with a lot of different combos trying to get these things to ride well. The Bilstein 5100's did a decent job on my 40, but in the end it wasn't enough. We built a set of lengthened progressive springs, flipped the hangers around in the back and it was a huge difference, I topped it off with a set of Icon Vehicle Dynamics shocks that I had valved fairly stiffly. My 40 rides like my less creative friend's JK, but it's a Toyota so it's not stupid

It's a pleasure on LA freeways and I no longer feel like I'm still vibrating when I get out of the truck after a long drive. The handling is so-so but without sway bars it's the best I can expect. With the shocks as they are the control is better than it has been and the truck is very predictable. This set up works so well we're going to develop a full kit based on what we learned.