I agree with those that comment about running the engine for awhile before using the levelers. The generator creates 14.1 volts which is more than the generator or being plugged into electricity. I always leave my engine running when camping until I lower the levelers and I've never had a problem.
Also, as previously stated, the hydraulic pump for the levelers takes much more power than the small electric motors for the slides.
I have 4-6 volt batteries to avoid any issues with the slides and they allow me to dry camp with the demands of the residential fridge.
__________________
|