I've always stored our 2008 Dynasty with the jacks down in our storage garage that has a nice concrete floor. The coach also has air bag leveling and I use that mainly when we are traveling at RV Parks. I feel the Hydraulic Jacks take the pressure off of the tires during storage and I let the system do it all automatically.
I had to be careful with the Hydraulics as we had punched through some asphalt pavement in RV parks including some of the gravel/sandy sites. That's where the air bag leveling became so convenient, the tires were the foundation.
Our new coach will have air leveling only so all the weight will be on the tires at all times.
MM.