When 5ers blow over?

I came across two in very few miles--I-70 in Eastern Colorado. Wind blown snow from the south melted on the roadway by traffic, then immediately re-froze into a nasty glaze of ice, sometimes visible, sometimes not. The first 5th laid itself and the TV on the right side. The second just a few miles later, had the 5th on its side and the truck completely upside down with the cab buried in the deep snow in the ditch--no glass visible, all under snow. Hopefully the cab wasn't crushed and the occupants survived. Clearly the TV and 5er did not.