I'll be planting my 29 ft. 5th wheel on my property for quite awhile.I'm having a concrete pad poured for it to sit on.What is the best thing to support the unit on.Jack stands,cinder blocks with wood shims???I would prefer to not take off the tires so I can move it out if and when I decide to move it.I realize I can't rely on the tires for a long stay.