I'm not too worried about dry roads and 40mph winds, but in winter we get some serious ground blizzards. Ice packed roads with winds that have exceeded 120mph.
They shut the roads when it gets that bad, but driving on ice in 40mph cross winds is pretty nasty. My 9,000lb 4x4 pickup with studded snow tires does well, but I do see a lot of semi's moving along pretty good in these conditions. And I also see a few of them with their trailers blown off the road...
Anyway blizzard performance is not a deal breaker. I can store my RV down in the desert over winter and just drive down to use it if need be.
However, being able to camp off of gravel roads is going to be very important....
I'm really curious as to how the 4x4 twin scroll's with lockers do. My guess is that traction will not be an issue, but clearance will be.