In response to all the anti-pull test guys, I don't always do a pull test either, BUT, it's NOT a bad thing, and someone mentioned that it's 'common sense' NOT to do a pull test. Well, being cautious...THAT'S common sense. The people who drop trailers didn't do that pull test. Your jaws may be locked but a bolt might be bad or you may have a stress (or manufacturing) crack/defect, and to drive away based solely on visual inspection is absolutely AGAINST common sense. It is also irresponsible to even suggest NOT doing the pull test (actually called a tug test) as there are many people brand new to the lifestyle, and until they become comfortable and proficient in what they do, they should take every precaution possible. And anyone who has a split-jaw type hitch (can't believe they even still make that design), you had BETTER do a tug test, don't rely on visual only verification. I personally know 3 people who dropped, every one of them had a split-jaw hitch.
There is absolutely nothing wrong with a check list. Pilots use them regularly, item by item, even though they have done it hundreds of times.
That's precisely WHY they have checklists, to counter complacency. We all get in a 'routine' and often end up missing something important. Checklists are a good thing!