I always store mine with blocks under the jacks and air system bled so that the jacks do not have to be extended. This minimizes loads on suspension and tires when stored. Jacks down is also a way many folks go.
John & Sharon, 2 Daughters, 2 Sons-in-law, 5 GK, 1GGK Rat Terriers (Twiggy, Annie) 1997 HR Imp., 38CDS, 1 Slide 325 Cummins C8.3Mech., MD3060, EBw/Coast.Sw., Toad-2003 GMC Envoy 4X4, Excallibar TB, Pressure Pro TPMS, Henderson Mot. Ctrl. Units