Originally Posted by macomb-lawn
I dunno, it says it can carry 16K pounds. I'm assuming it's total and not per axle. Regardless, there isn't even 8K pounds in the trailer. It's only 5 yards or so.
Is that topsoil? I'm betting it weighs more than 8k
Trailer weights at least 5k and your max GVWR is 16k. IMHO it is entirely possible you were overweight.
Aside from that I would make sure the hitch on the truck is rated to tow 16k lbs. (if it is a factory hitch it is not), and also that your receiver is rated for 16k lbs.
Just some food for thought.