I see a lot of 4wd crew cab pickups on the road lately. These road locomotives usually have no more than the driver aboard most of the time. But in case one has to get a squad of infantry to the front line...
My extended cab half-ton 4WD pickup replaced my Ford Explorer. The pickup gets significantly better gas mileage. At the cemetery this summer, I asked the guy from the vault company what kind of mileage he gets with his big three-quarter ton (or maybe a one ton) 4WD diesel crew cab and I was surprised by his answer. He gets better than 25 mpg in mostly mixed city/highway driving. That's better than many smaller automobiles. You don't have to have a truck full of stuff all the time to make it worthwhile, just often enough that it's cheaper than owning a second (or third) vehicle. Newer technology is having a significant impact on the fuel economy of larger vehicles as well as the smaller ones.