I knew better than to put too much pressure on my stablizer jacks and did it anyway. The street side rear caused the siding to flex to the point that the lower row of siding broke loose right at the c...
The problem is not the jack that is twisting of the frame. You have the weight of the axles and tires pulling down the middle while you try to lift the end of the frame.
You need to put boards or leveling blocks under the tires so the TT is level from side to side. Then use the tongue jack for leveling front to back. When the TT sits level on its wheels and tongue jack, then you can tweak and stabilize with the jacks or block etc.