I have both, a pickup and a UTV (Rhino), and I prefer having each for different tasks as each is WAY more useful than the other depending on the task. My truck does more damage to my fields than my UTV. The UTV suspension eats up the bumps of the fields better as well. Any pickup that does well on interstate travel is going to suck on my fields. 25MPH across my field in a truck repeatedly, you'd be replacing door hinges at a minimum. 25MPH across my field in the Rhino is no problem, about the same as 25PH on a gravel road with my truck (reason is, a UTV generally has almost the same suspension travel as many stock trucks, but is tuned for much slower off road travel)... UTV also fits more places. We commonly use the UTV with a pull behind garden dump cart to follow the mower around the lawns to dump the bags of grass into. I wouldn't want to drive my truck on my lawns.
To lighten a truck down and swap the suspension to something soft enough to ride the fields would take a considerable cost or time investment, and likely make it illegal to have on the roads. I've got less in my Rhino than you spend on a really good set of off road truck tires...