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...
I have been towing RVs of all types for over 60 years and I have owned four 4x4 P/Ups and one time I got stuck in sand and used the 4x4 . I have no use for 4x4 other than that one time