One special feature of expedition trucks with huge tyres is when they get bogged, they dig themselves a hell of a lot deeper into the dirt so they are just that much harder to unbog. With a 6 X 6, that bogging process just happens 50% faster.
Two years ago there was a lot of rain and the campground turned into a quagmire. There is a picture of a 6 X 6 sitting forlornly in the middle of the campground down to the chassis.
Another notable feature of many - shared by my F350 which is a worry - is they have massive tow-hooks on the front and nothing similar on the back. Hard not to draw the conclusion that they get bogged easily but aren't much use getting others unbogged.