How Long Do They Last - U-joints
 

As the title says, just wondering what your experiences have been with rear driveshaft joints. In this case, my truck is a 2wd 2019 1500 LD w/5.3 and 6-speed.
I did some cursory searching, but didn't actually use the search function (yet) because I have not always had good forum luck with those. And in a cursory search, did not see any similar discussions.
I'm pushing 70k miles now, mostly around town. And I hate to say it, but while I used to be able to call myself a "car guy" before this, I literally have not even been under the truck to see if the joints are even greaseable! I even let a shop change my shocks! Oh, the shame of it all. As Doctor Smith would say... (old guy reference)
My assumption was that they were not fitted with Zerks, because that's how the O.E.s have tended to lean over the past few decades.
Anyway, would like to know what you all think.

I have a bunch of these questions, such as wheel bearings and brakes and spark plugs and belts, but figured I'd stick to one at a time to keep each thread as clean as possible.

Thanks!

Paul