Jack-Knifing vs Trailer Swinging

[Thorin]

As you may or may not know we bought a travel trailer this year (yeah, okay, I've been mentioning it lots).  Anyway, so I've been reading lots about trailer towing, trying to learn more so I'm a better driver.  And I came across this:

http://www.e-z.net/~ts/ts/JACK.HTM

It shows the difference between jack-knifing and just swinging your trailer out, and why there really is a difference.  Kinda cool, I thought.