I have ATC on my Coachman 560, and Stupidly, decided to go that little bit extra," 65, its been ok before, "passed an Artic uphill, just passing it , suddenly the van went into a wild swaying, the silence in the car, was only overcome by the smell. Three maybe 4 occilations, very big ones and suddenly the vans brakes came on slowed us , within seconds, and straightened us to about 50 mph. Yet again silence for the next 2 miles. IT is agreat system, reminded me , again take time, you only gain minutes. I hope I will never feel it again.