Steve-
I'm sorry to hear that this happened to you, but thanks for posting it for us to see. I'm planning on repacking the hubs on my trailer, now I will check the backing plates when I'm in there!
(I certainly wouldn't have thought to check that!)
BTW... Do you mind me asking who those axles are manufactured by?
If it makes you feel better, our ride wasn't without it's share of troubles either.
First I had some cooling issues that made us run with the heat on full-blast to keep things cool for the rest of the trip...
Then the other truck that was with us got a flat tire on his trailer...
Followed by another trailer-flat just 30 miles up the road...
Since he had done all of the "right" things (tires properly inflated, trailer loaded correctly, obey posted speed limits, etc) he decided to scrap the remainder of the nearly new tires even though they looked fine and got 5 new QUALITY trailer tires. Smart move in my opinion!
I think this may be another area where trailer "builders" are saving a few bucks.
One of the members of our group said it best when he reminded us how many times we've trailered to these events without any problems. Sometimes that can give a guy a false sense of security and times like this make you never let your guard down!