Thinking in theory is fine, but as for bending....
In reality, the bending from jacking at the rear corner is bad. It can even cause the door to jam.
There is no pot hole that puts upward pressure on the rear corner.
I know because I had a camper n tried to jack at the rear and all these bending issues discussed became harsh reality.
Stabilizers at the corners are fine, they do not bend things.
Jacks at the corners is not good unless the trailer frame is massive, or has steel walls that can help support the stresses.
The reason to jack at or near the axle is because that is where the trailer is supported to begin with and lifting here will not stress anything.
I see stabilizer lifts on motor homes, but those have axles at the ends, not in the middle, so is different.
I almost never use jacks. Trailers are easy, just drive one side up on blocks, rocks, or drive one side into a hole. Then use the tongue jack for front/rear level.
When I use rocks then I can just drive off and not even retrieve the rocks as I would my blocks.
