I am not sure I agree with your interpretation of "never raise the rear wheels". To me that means don't let the rear wheels go unweighted, or much reduced weight bearing.
To me that means you can have have the rear wheels higher than the front but still supporting the weight of the unit, like parking on a steep hill, facing down the hill. Seems to me you could drive up on a ramp in the driveway to raise the rear end.
If I misunderstood your post, just ignore this. Sorry.
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