I've never heard of that either.
For winter storage, I put blocks under jacks (maybe 5-6 pieces of 2x10s), then lower the coach on those. Takes the weight off the tires.
Edit: I got curious and looked at the Windsor manual and sure enough, there is Horizon Leveling. That's for rest breaks etc.
For long term storage, search for "long term storage" in your manual. The procedure is the same what I'm doing.
2004 Holiday Rambler Imperial 40PKD, Cummins ISL 400
2019 Buick Envision AWD