I have a double cab, but otherwise, the weight I carry is probably similar to Dave's truck. I have the same rear springs with the top overload leaf removed, and TImbren SES bump stop replacements inverted to keep crud from building up in their cavities. That worked fine until I added more constant weight with a GFC camper. I have the D29XL leaf to add this winter for more support; not sure if I'll add the top overload back. I have a rear shock mount relocation kit to install, along with longer King 2.0 shocks, and new spring hangers/shackles.
I have Fox 2.0 shocks with reservoirs on the rear, and Fox 2.5 coilovers on the front. I have an aluminum plate bumper, synthetic winch line, and a single battery, so I didn't feel the need to use 700 lb springs on the front. I also added SuperBump bump stop replacements to the front. If you lift the front 2" or more, you may want to add aftermarket upper control arms (UCAs) to allow for more positive caster angle. I have JBA brand ball joint UCAs, and have been happy with them. I've used Light Racing UCAs, but decided I wanted something a little less fiddly.
Adding the Timbren SES to the rear made a big difference immediately, and I wasn't in a hurry to do more than that until I started towing more.