Your rig, like my Lexi, probably has the same airbag system, Firestone.
If you read the owners manual/install info, it will tell you not to run the bags without air. Keep a minimum of 5-10 psi. Don't know if this applies to storage. But i've kept around 30 psi in mine over 3 winters with no adverse effects. I would imagine that keeping air in them would prevent them from developing cracks in any creases that would form if flat.
Tire sitting for a long time with air in it lasts alot longer than one without air.
Steve & Cheryl + Charlie & Casey, our furry kids.
2012 Forrest River Lexington 283ts
Toad, 2013 Subaru XV Crosstrek
Camping trips this year so far...8