Yo Rich!
It was probably the mismatched tyres wobbling about on those narrow time that reacted badly to a twitch of the steering wheel. Goat? Falling asleep on a straight road and waking up with a "WOAAAH"?
Whatever, you're not putting those Carlos Fandango wheels on my truck ;-)
I hope they were all wearing seatbelts and nobody was hurt. I also hope that nobody was taking a nap in the back when the pop-top went flying off. :Wow1: