I would never have a 4x2 truck. I routinely have to back my flatbed trailer uphill on gravel. In the winter it's pretty tough in 4x2. In the summer it's impossible.
Loose, dry gravel at low speeds is just as much of an obstacle as snow.
Driving 25 miles on plowed roads or driving to a tree falling site may well be within the reach of a 4x2. Tree fallers work where the roads are built to handle log trucks after all. Most passenger cars could make it up there.