A comment on the comments about change in "ride".
Having loaded my tires, switched back to empty turfs and now back to loaded tires I guess I would now describe the empty tire ride as too bouncy - say like a 50s Cadillac with shocks that went out 100,000 miles ago. WAY too much spring, but no shocks. This should be no surprise, tractor tires are HUGE air bags.
By comparison the filled tires are less bouncy, not saying you stay down hard as in a sports car, but the lack of leaping around is generally better.
By no means is there a "solid wheels" ride, which I think some people expect with filled tires.