was this one of you guys??

There's no way to know for sure, but it looks like excessive speed to me. Also, it looks like he had time to grab his brake controller and apply some braking to the trailer to get it back in line.

I also wonder about his loading. There appears to be quite a bit of weight in that rear cargo platform.

His TV looks to be at least a 250, so he shouldn't have been undersized on his TV.

But that is all speculation by me. I wasn't there.