Bilstein and Rancho 9000 get great reviews pretty much everywhere. Can't go wrong with either. Bilstein makes 4600 series and 5100 series as the standard. Those shocks share the same valving. 4600 is for stock and has a blue/yellow finish. 5100 states it's for 0-2" lift (I've never figured out the difference between stock and 0" lift) and has a sort of chrome finish.
Shocks help dampen the effects of springs (which absorb the bumps). Without shocks (or with crappy ones), you will bounce a lot more, which will cause loss of control.
For example, it's really easy to lose your rear end on washboard dirt roads with crap shocks. Better shocks will keep your wheels/tires planted and in better, more consistent contacts with the road. With good shocks, you can go much faster on that same washboard dirt road before you start feeling the rear end getting loose.
Factory shocks are just terrible. Probably 10-40K miles is as good as you'll get. Some people replace their shocks straight away on a new truck. I tend to keep mine for a while.
Every time you use an apostrophe to make a word plural, a puppy dies.
RV: 2018 Rockwood Mini Lite 2504S
TV: 2019 F-350 Lariat 4WD CCSB 6.7 PSD 3.55, 3,591 lb payload
Former RV: 2007 Fleetwood/Coleman Utah
Former TV: 2005 F-150 King Ranch 4WD SCrew 5.4L Tow Package