On my 2002 Windsor the air bags do not fill to "travel" position when I start the engine as long as I leave the auto leveling switch on. When I turn it off the bags will fill.
I always dump all the air before leveling to put the entry door step as low to the ground as possible. sometimes I need to start the engine to air the tires before leaving the CG, and I usually do the the afternoon before we are leaving. That's the reason I don't want the air bags to fill back up!