Most full-sized trucks come with beds smaller than 6.5ft, that doesn't change the fact that most trades people drive full-sized trucks.
Four wheel drive is more necessary in specific climates (before the snow tire scolds come in, I run snow tires in the winter) and because an unloaded truck has a light rear end. Many trucks with 4wd can switch between 4wd and RWD. My truck has RWD, 4A (4 auto, aka AWD-ish), 4 high and 4 low as an option. I drive mostly in RWD unless I need power to all wheels for traction in snow and ice or when I am accelerating quickly off an incline (think uphill a dirt road onto blacktop where you have a blind corner) and then I drive in in 4A. I have needed 4 high and 4 low a handful of times. I have a "big v8" and get 21-22 MPG on the highway in RWD and and 18 or so around town. I drive heavy all-terain tires or my MPG would be better.
Four wheel drive is more necessary in specific climates (before the snow tire scolds come in, I run snow tires in the winter) and because an unloaded truck has a light rear end. Many trucks with 4wd can switch between 4wd and RWD. My truck has RWD, 4A (4 auto, aka AWD-ish), 4 high and 4 low as an option. I drive mostly in RWD unless I need power to all wheels for traction in snow and ice or when I am accelerating quickly off an incline (think uphill a dirt road onto blacktop where you have a blind corner) and then I drive in in 4A. I have needed 4 high and 4 low a handful of times. I have a "big v8" and get 21-22 MPG on the highway in RWD and and 18 or so around town. I drive heavy all-terain tires or my MPG would be better.