My Miramar's auto level is set to have a slight tilt to the driver's side. I once manually leveled and found the toilet would plug up right underneath the bowl, requiring me to physically move the "stuff" away from the hole with a stick (yuck). The AC also would drain down the patio side of the RV causing the same problem you described.
My RV dealer said they programmed the auto level to that slight tilt to allow the toilet to flow better to the drain and the AC runoff to be less problematic. He also said front to rear level is critical for proper slide operation. But being off slightly side to side causes no problems.
I can't tell a difference in the RV other than no more toilet "issues" and no more AC runoff in the wrong places. Pretty smart RV dealer.
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