I'll be shopping for a new (or new-ish) truck shortly for pulling a medium size trailer or 5th wheel. It seems like the vast majority of 3/4 and 1 ton trucks around here are 4WD, with jut a few 2WD...
We've NEEDED it 3-4 times in two years. We have several local campgrounds that are steep and have gravel roads. We've USED it dozens of times. It allowed us to use our tow vehicle on basic trails in Moab, Capitol Reef, Ourey and many other places.