If I'm reading this correctly, you are putting one of the front landing gear down 3-4" further and then lowering both until they are in contact and the landing gear is thus leveling the trailer side to side.
This is the wrong way to do it and the lowered leg will start lifting first and twist the frame. It may or may not do damage and it may or may not take multiple tries before damage appears.
The correct way:
- Level side to side with boards under the tires.
- Block the tires in place.
- Unpin and let both front legs drop to the ground.
- Then raise them up 2-3 holes (more if you need to lower the front significantly to get the trailer level fore and aft). The key is you raise them the same number of holes before putting the pins in.
- When you lower the legs with the electric motor they should both hit the ground at the same time (use the screw at the bottom of the legs to fine tune)
- Use the electric motor to level fore & aft.
- Deploy the rear stabilizers (but only to take the bounce out of the trailer, not to lift the trailer tires)
The rig should now be level and stable. Once you get the hang of it, it's a lot quicker than writing it out.