Well its OK if the front wheels leave the ground to level. However, I would suggest to lower the front back to Earth before bringing the slide rooms back in. The unit does not have to be perfectly level for the slides, but it does need to be free of a "bind" that may occur if any of the levelers are pushing harder than the others.
As far as the fridge is concerned. They can be as much as 3/4 of a bubble off level these days. The newer units have the evap/cooling tube longer than the old days. They actually go up and over the top of the fridge now. This allows the stuff to rise up, and eliminates the "vapor locks" of the old days when the units had the short tubes.
I started with nothing, and still have most of it left
2001 Jayco KIWI 23B
2003 Jeep Grand Cherokee 4.7 AWD