I don't know what the factory articulation limits are. I guess you could always cycle the front and rear between the bumpstops to figure it out. The rear sway bar also limits your articulation, so many of us remove it
after upgrading the shocks.
Your truck can withstand a lot. Abuse is rather subjective. If you drive into things with abandon, you'll break stuff.
On a stock suspension it seems shocks go first. They're pretty worthless as is, so it's not much of a loss. Then leaf springs and sometimes torsion bars wear out. With suspension lifts, tie rods, CV joints and centerlinks undergo more stress.
Taking off the rear sway bar is the simplest thing to improve your articulation. Then you need to start looking into lifts. Some people remove the front swaybar, but this should only be done in low-speed offroading situations.