This didn't happen to me, it happened to a friend back in the '80's.

My friend was road racing a 1600 Datsun roadster in one of the production classes. He was using a tow bar on the roadster and pulling it with a 1200 coupe. I always thought he was nuts for flat towing the roadster with the 1200. He would load the heavy stuff in the 1200 and the lighter stuff in the roadster but the roadster still outweighed the 1200 by a good margin.

On Sunday evening on our way back from a trip to eastern Oregon we saw the 1200 and roadster combo pointing east on the outside eastbound shoulder of I_84 just east of Portland. This was bugging me cause I knew he had raced in Spokane that weekend. If he had a break down on the way home he should have been west bound side.

I gave him a call and found out that he had got cut off in traffic and had to get on the breaks hard. He lost control and did a 180 degree spin while sliding across the grassy median and across both lanes of on coming traffic coming to a stop on the shoulder of the east bound lanes. There was no damage to either car and fortunately no contact with the cars in the east bound lanes. This happened at ~60mph/~100kph.