Do you still have the ok sway bar hooked up in front? Soft in turns is kind of surprising, tires underinflated?
Well if single wheel K30 then it will ride a little bit better, but still not smooth. Rear springs stay the same while fronts are changed to up arched leaf springs. Shocks can help a little on road but really work off road much better. Then upgrade your steering stabilizer shocks to a dual setup for the extra strain from larger tires, and help with Death Wobble.
If you have the dual wheel K30, well there is no ride you just hold on because the truck rides like a wagon with no suspension at all. I have both with 6 inch lift 35's on one, 36's on the dually with spacers. The shocks help little again on road but do help much more off road being you are more aggressive and help much more with compression. More weight also to control. The same with steering dampers, double up.
You can purchase a different set of softer springs for more "flex", and in the rear experiment with dropping out some leafs in the rear, or shackle flip instead of blocks, and or larger arched springs. Race offroad trucks lots of flex, large reservoir
nitro shocks.
So many options it just depends on how you decide to use the truck. I use mine like mules so I put on a premium Delco, or Gabriel, Tuff Country on the dually, all around. No gas, just larger piston. When crawling loaded offroad, pulling, the shock in my view is not doing to much other than some roll control, less quick spring reaction. But when I DROP THE HAMMER on that dually, Heavy, empty, and 450HP 454, well the more Aggressive you are the Better your shock better be to control the compression stroke, or spring wrap up. With large spring packs, rebound is controlled somewhat, but not like the compression stroke.
YMMV Just my 2 cents which means nothing.
The D30, 1008A1 I have left alone because the truck went through a maintenance overhaul in 2010 with everything marked as such. Lots of NAPA, shocks included, new tires, windshield, dash, seat. Even fresh CARC painted local camo scheme.