After reading the immature reputation comment you left for me, and re-reading the thread, I'm wondering if you missed the fact these trailers do NOT have a "dumping feature". Some people have that idea, but they are wrong. These trailers are not designed to dump by setting the brakes and backing up. Yes, I know a well-known surplus dealer advertises them that way. That surplus dealer wrong.
The pivot feature is there so that the tongue can be dropped down to facilitate storing or shipping a lot of trailers in a small space - they drop the tongues and shove the the trailers together in long rows.
It's NOT made for dumping.
Yes, you CAN get it to dump. Many people have. Many people have also broken their trailers doing this. The pivot point is NOT made for that kind of stress, and it's not at the correct angle.
It's all in the TM. It has already been suggested that you read it. That was good advice.
The advice I have given is the procedure I use. When I have a load of something dumpable, that's what I do. It works well enough, and it doesn't run the risk of breaking my trailer. If you don't have a farm jack, seriously consider getting one. They are amazingly useful.
If you think advice on how to avoid breaking your trailer is "useless", why are you here? Why even ask for advice? Just go do what you did the first time, but apply more power. That always works. Something will give sooner or later.