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...
4x4 for us.. We Live in the Sierras and use it quite often.. Towing a large boat and going up a steep ramp 4x4 comes in handy to pull out of a wet situation. Towning a Ruing in Oregon we have been in parks that are Grass.. On grass its great not to get suck.. The extra resale is also worth it.. most want 4 wheel drives..