Originally Posted by Oaklevel
The stabilizer jacks should not have any trailer weight on them they will not support the trailers weight.
It would be very dangerous to you and your trailer....... seen many buckle under weight.
As was mentioned put blocks under the tongue frame if need be, to put the blocks under the tongue jack.
Why? The OP said scissor jacks, not stabilizer jacks. There is a difference.
I have six scissor jacks rated at 7,000 pounds each. The only way they would fail is being stressed by forward/backward movement of the trailer (i.e., driving away without retracting the jacks).
That being said, I would be concerned with the trailer moving on the hill in the picture. Those chocks don't appear to be very substantial.