Hi Dufferboy,
The answer depends on whether you have manual leveling or the auto-leveling system.
With manual leveling, side-to-side leveling is done at the wheels, by putting boards or other devices on one side or the other to get the trailer level. The front landing gear are used to level front-to-rear. The hydraulic fluid flows between the two jacks and they will adjust to different heights, but will not apply any side-to-side leveling force.
With auto levelup, if you use the AUTO function and it consistently ends up off-level, you need to follow the zero-calibration procedure.
ZERO SETTING THE CONTROL
1. Turn “ON/OFF” button “OFF”
2. Push “FRONT” button 10 times,
3. Push “REAR” button 10 times
4. Control will flash and beep, LCD says “ZERO POINT CALIBRATE”
5. To memorize this level condition , press “ENTER”
6. LCD says “ZERO POINT STABILITY SUCCESSFULLY SET”
7. The control will then turn off.
8. Turn “ON/OFF” on to commence operation.