if the wind can turn one over standing still (it happens) then rolling down the freeway will make no difference at all.
Mathematically, (using Turbs' new 320RS as an example) you have a length of 38 feet and a height of 12.5 feet. The roof slopes, so lets figure an average height of 11.5 feet. That gives you a skosh over 435 square feet of sail area. With a GVWR of 14300 that works out to 32.75 pounds per square foot, or .22 pounds per square inch of sail area.
Using the conversion of PSF/.00256 (standard PSF to MPH at sea level formula) you can see that to completly offset the weight of the camper you need about 112 MPH. At that point, you probably got bigger problems than worrying about your camper. But it only takes about 61MPH to display 1/3 of that campers weight. 61 MPH crosswinds are common in certain locations. If you hit one, you just side-loaded your truck to the tune of about 4300 lbs. (not including the sail area of the truck itself). Look at it this way. You will now have a GE J85 Turbojet engine in afterburner sitting cross ways on your pin box. You WILL depart your direction of travel. And while I cant calculate the center of mass of the camper, as it is higher than the center of rotation (the road) in the roll axis, you have also generated a significant roll moment. If your center of mass height is over 1/3 the total height, then that would be enough to roll you over on your side.
Driving skill, attention or experience has nothing to do with it.
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