They drove it like idiots and blew a tire. Land Rover runs OEM street tires on stock vehicles at Poison Spider and Hell's Revenge, and they're not dragging vehicles off the route. It's pretty simple, really - as slow as possible, as fast as necessary.
That eight-inch rock is well within the capability of those tires. I have used them in their various incarnations on multiple vehicles all across Colorado, New Mexico, Wyoming, and Utah on obstacles larger and more complicated than that and have never had an issue. But if I lined up three feet from a square edge obstacle and ran at it, sure, I'd probably blow one, too.
Great example - here's my D5 at the upper trailhead at Yankee Boy Basin. See the green jeep? Driver rear tire was hissing air from a cut in the shoulder right between two tread blocks. Those tires were MTs. And if you look closely, at the upper-upper trailhead, there's a Toyota Hiace 4x4 (or something like that) on skinny little tires that I assumed were ATs, since I'm not aware of any MTs or better that could fit those little roller skates it rides on. Couldn't tell if they had any flats but they seemed to be enjoying themselves so I am guessing no.
If you aren't a great driver, sure, more meat on your rims will mitigate poor line choice, ham fists, and lead feet. And if you want click$ on a video featuring a vehicle people love to hate, there's no better way to do it than to blow a tire on a simple obstacle. The hard part, which they failed at, is doing it so that it doesn't *look* like you're trying to do it.
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