Interesting idea. Question though. I'm assuming you use the ratchet straps between the 2 eye bolts. When you tighten the strap, the support literally digs into the dirt (or pavement) and the other end presses upwards against the inside of your trailer frame. I see how that could make everything more stable.
But, when you break camp, how hard is is to get those supports out-of-there? If they've dug into the ground, or wedged themselves on the asphalt or concrete, can you still break them free? Or do you have to raise the trailer end to free them?