I don't want our turf tires filled to save the lawn, but will be filling the Ag tires when they come off in the next week or two.
My plan is to use our 35 gallon plastic barrel and mix RV antifreeze with water to get close to a 10*F freeze point. Then I will break the bead on the valve stem side of the rim and pour the mixture into the tire. When fluid flows from the schrader valve, it's full - laying flat. Then I can top off with air to about 6psi or so.
I've not done this yet, but a guy I trust swears it will be the cheapest and easiest way for me.