A lot of interesting things are found at SEMA, and plenty of them are outside my area of focus, but occasionally some of them are too impressive to not pass up on, here's one, the Pullrite Superglide

I could try and describe it to you, but it's highly doubtful I could do any better than this one video I found....

The key point is that this 5th wheel does a lot to prevent a trailer from hitting the trucks cab when hard cornering, by moving something like 14 inches back, away from the cab, only during cornering when as I recall. I might be off on the number accuracy, so don't quote me.