But on size, there's no getting around the fact that the Raptor is huge, in both trims. At some point there are many trails which you literally won't fit down because the trail is too narrow.
I am not sure that there are trails that you cannot fit a raptor through, that are legal for 4 wheeled motor vehicles to pass through, as long as you don't mind scrapes and pin stripes. If you are talking about single track dirt bike trails or snowmobile trails, sure. But most 4 wheel legal trails should be passable. Example: I go rock crawling in the north east where Class VI roads are pretty narrow like this and I have no trouble fitting the Raptor, or any other big vehicle through:
The Raptor can get through all of these, albeit with significant pin striping. Sure, there is no denying that width and long wheelbase are detriments, but there aren't too many trails, even up here where trails are narrow, that are too small to fit a raptor through.
Overlanding or expedition travel is a lot easier and a lot more forgiving. The trails / dirt roads you typically travel on while overlanding are much wider. Like this:
So width, size and weight are even less of an issue when overlanding. Except for the silly Wranglers, every one of the vehicles in this photo is a really good overlanding vehicle, and none of them are small or light. Speaking from experience, the Raptor can do everything any of these vehicles can do, easier.
Point I'm making is that the Raptor can most definitely handle overlanding. Would it be easier to drive something smaller and narrower? Of course. But you'd have to stop 3 times more often for gas, and will have significantly less space and comfort.
There is a reason classics like the gwagen and the j70 are so thin.
The reason the old classics are thin have more to do with the time they were built than a conscious design choice. All cars and trucks back then were smaller and thinner. And believe it or not, there are so many cars that are better suited to modern overlanding than those oldies. Power output, inverters, space, aftermarket support, lights, comfort, ruggedness, range - all more important for successful overlanding than having triple lockers. I'd take my 36 gallon tank and 500+ mile range, and storage capacity over being narrow and underpowered while out in the Maine wilderness in the middle of winter.