There are several recommended ways to store your tent, but first be sure the tent is dried out.  If you have to close your tent wet when you leave camp, always open it up and dry it out immediately upon returning home.  Mold and mildew can form if left for too many days.  When removing your tent always get another person to assist you.  This will help prevent you from injury and possibly damaging your vehicle.  If you have to remove the tent yourself, a hoist system of some sort is recommended.  There are several kayak hoist systems that would work great for this.  If you have to take the tent off and store it in your garage, make sure you never set the tent down on the cement which could damage the exterior PVC cover.  Always use a foam pad to set the tent on, and yes, it’s okay to set most models on their side.  One thing people don’t think of, is wrapping the tent up in a tarp to prevent rodents from damaging the fabric.  The best recommendation is to wrap the tent in stretch wrap to protect the fabric from moisture, dust, and critters.