We have a different tact that was explained to us at Camp Freightliner. We had blocks made that are slightly less that the distance from the upraised jacks and the floor of our storage area. We slide the blocks under the jacks with just enough clearance so that we can put the blocks under the jacks. We then turn on the automatic levelers which deflates the air bags and allows the rig to rest on the upraised jacks and on the blocks. This reduces the pressure on the jacks and on the tires.
I realize that you are using a gasser so this may not apply to you, but you may want to consider some variation of this method. It did make a lot of sense to us when it was explained to us.
2011 Berkshire 390bh