Not going to argue either way as I don't have Jacks but our driveway is just as bad requring me to lift the front at least 6" to get the fridge to run correctly.
I keep a pair of these
RhinoRamps (Amazon) in the garage for just this purpose. They are exactly the right height for us to run the fridge (and at 16k lbs max capacity are easily capable of handling our 12k RV).
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