Don't get me wrong. I love driving my wife's Dakota SLT 4x4 pickup in the mountains in the winter. The long wheel base is very resistant to rear wheel slide out with added weight of a low campershell on the back. The campershell provides added and necessary weight over the rear wheels. And it provides safety during a rollover accident like a "headache rack" does.
(I prefer to drive my 1995 Bronco with studded snow tires. But more than that I love our 4x4 converted diesel van which is so heavy it is like driving a tractor with studded snow tires. But it could lose its tall fiberglass top and eject unbelted passengers during a rollover. So, I drive it slow, like driving a van. BTW, I have driven a number of brands of studded snow tires over the past 30 years. The Goodyear Wrangler Duratrac when studded, are IMHO, simply the best.)
Back to conveying this knowledge: Remember when truck doors were inset into the cab and under the roof and the roof had "rain gutters." In that design, the door frames actually supported the cab roof during rollover accidents.
Rollover accidents are pretty common in mountains in the snow.
Just something to consider with pickups with modern bodies where the doors "clam shell" to the sides of the cab roof -- not inset under the roof. Y2KW57 is an industry insider and is famous on the ford-trucks.com Super Duty Powerstroke Diesel sub-forum. The photos below are from one of his threads.
2017+ Super Duty - If the next Super Duty had the same cab as the new F150, would you approve? - If the 2017 model year (or what we've been calling the 2016) F-250-550 Super Duty had the exact same cab, from A pillar to C pillar, and everything in between, as the new 2015 F-150, would you...
www.ford-trucks.com
My wife's Dakota is a clamshell door design. But I feel safer driving it with a low campershell on it for both rear wheel traction and for added safety during a rollover.
A little family trivia. My wife's front license plate frame says:
"When Hell freezes over, I'll ski there too."