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...
If you stay on pavement most of the time then 4WD will be of minimal benefit. It occasionally is useful in campgrounds. I've used in in some soggy wet cg for example. Or if you have to back the 5ver uphill. But those aren't that common.