Another rear crossmember upgrade for you to consider is one many of us have performed.
Rocky’s upgrade does an excellent job of preventing damage to the crossmember from floor jacks, but leaves the pinch weld at the rear of the crossmember still vulnerable to damage.
In general that pinch weld is about 1/4 inch deep but it may vary.
using the appropriate thickness, a 12 to 16 inch piece of steel bar can be attached to the bottom of the crossmember, forward of the pinch weld, so that the bar is first contact on a floor jack.
I imagine welding would be the ideal method of attachment, but I think bolting the flat bar to some threaded holes tapped into the crossmember would suffice. If bolted, I think fully covering the bar surface with a quality RTV prior to bolting, would help minimize any water intrusion.
I tried to take a photo of mine just now, but with it only about 4 inches off the floor, and all painted black, the photo is worthless. 😉
Larry