Well I have to tell this knowing it will probably get some laughs,but,that's OK,I won't care and no harm done,so,I can laugh about it this time myself.

My husband and I went to pick up our stock trailer (the one I posted a thread about with the lights) at the location a few miles from our home where we keep the trailer.I backed up to the hitch,he hitched it up.I didn't look at it,but stayed behind the wheel.He even checked a tire and put some air in it,and I drove it back home.

When I pulled into the driveway,I pulled all the way up on our concrete pad that we park on in front of our garage prior to backing the trailer up in the yard to unhitch.Well,there is a slight drop off where the gravel has worn away,and when I stopped the truck,I saw the trailer behind me in the mirror jumping up/down like a Pogo stick!!! I said,"What in the world is going on??" He got out,and looked,and told me to pull up just a hair,which I did.I then observed him cranking on the hitch.When I asked what was wrong,he said that "apparently he didn't latch the collar on the hitch when he lowered it onto the hitch ball" and when I pulled up on the pad and the back wheels on the truck went over the dropoff,the trailer hitch bounced off the ball and the chains were holding it!!!

I almost broke out in a sweat,thinking about pulling it the 5 miles or so we'd come,and through a little stretch of hills,running about 40 because I was behind somebody driving slow.!!!

I guess the bottom line here is,and,I remembered this old rule a friend once told me (and I forgot it!) is: if somebody else hitches it up,you need to double check behind THEM.I'm extra careful when I hitch up,but,well,he was tired,and,you know how it is.We were just discussing this on the QuikCoupler thread,about using chains.

Wholey Cow caca batman!!!!!!!!!!!!!! That's why my hubby don't touch my trailer. If I haul cattle I hook up myself, if he hauls he hooks up. We are both different and it can causea issues. I'm more the safety minded on the trailers, he's get "em to the market and get home, YIKES!!!!  Glad all was okay though

He is usually really good about those kinds of things,because,he had his own horse before we met,too.I guess he was just tired,and I forgot to check behind him (the rule I usually always remember!)

Once,we were in from a show and parked our GN out where we had our horses pasture boarded.It was late and we were tired,and without thinking,ONE of us (can't remember,I think it was him!) put the tailgate up on the truck.I looked back JUST IN TIME to see the GN coupler take the tailgate nearly off.That's a mistake you might make once,but,you usually won't be doing again either!

VERY Fortunately for me, I load the horses in the pasture and then pull up next to the house. 90% of the time, I stop in the driveway and run into the house to retrieve something I'd forgotten. This was one of those times. When I came back out of the house I briefly glanced at the coupling I saw that I'd forgotten to slide the collar back on and secure it with the pin.

- Gees I HOPE to never do that again and since then my daughter is always asking "Did you RE-check everything?" and I never get grumpy when she asks!

Wow!  That's scary.

We have a rule that at least one of us (it usually ends up being both of us), do a walkaround of the truck and trailer before we pull out.  We are at a boarding stable and I have seen people on several occasions drive out with open doors on their trailer.  The last one was a woman who pulled out onto the road with the ramp down.   

DANG! My husband used to ride with a bunch of older men,and one of them (he's gone,now) did a couple of scary things.He was on a ride and they got to looking at his trailer hitch,and he didn't have a nut on the bottom of the hitch ball! Another time,he was driving back and they were following,and he didn't latch the back doors on the trailer,and they came flying open,his old horse,Danny,just standing in there looking back at everybody like he was having the time of his life!

"Buell" was his name,and,he reminded me all the world of Richard Farnsworth,the actor,who starred in "Comes a Horseman."

Yes that was a close call....

We had a similiar thing happen to us but it was a little worse.

My husband and I had a 4 horse straight load trailer that was about 32 foot long. Older model trailer. We had hooked up and loaded our 2 horses up and then when by his uncles house to pick up his cousins 2 horses. These are real hilly areas due to the mountains in Alabama. When we left from his uncles house this is where the delima began.

We turned to pull onto the interstate. We then heard a loud bang. We looked back and did not see anything out of place so we figured we ran over the curb. So we went on down to the next exit to get gas. Which was about 3 miles on the interstate.

When we pulled up to the gas station (which was up hill) we heard the noise again and then we heard a loud scraping noise. We looked back and our trailer was at the back of the bed!

We liked to have died! We had this trailer loaded down with 4 large quarter horses and it had been riding off the ball all the way down the interstate!!

Needless to say, it was not long before we purchased a new trailer. That hitch was very difficult to lock being that it was an older trailer (1970). Everytime after that we were so scared that it would pop off the ball again.

I guess you will have to use your Imagination

My husband was telling the trailer story to a guy at work.He said,"I got one for you" and told this: they were coming back from "someplace up north" as we say,pulling a long utility trailer,typically called a 'car hauler' BP hitch.They were running about 70 mph,and at some point,noticed the trailer was not BACK THERE any longer.They turned around and were headed back,someone stopped them,told them that they were just now able to catch up with them to tell them it had come off.They found it,had run down a ditchbank,and started back up,and gotten stuck.Imagine that thing,a 70mph unguided missile meeting you on the road? I guess (obviously) they didn't have chains hooked up.