I did put the green slime in 2 of the tires, but was not sure how well it would hold. The original tires has a compound in them that did not seal very well. The one innertube had a hole in it that allowed the liquid to leak all over the inside of the tire and would not seal. I replaced that Tube and put the Green slime in it. If the Green slime will hold, great. Time will tell.
On another note, our local Goodyear tire dealer did not know what I was talking about when I inquired about foam filling tires.
My local John Deere dealer suggested a tire shop 23 miles down the road. Will check with them monday.
Thanks for the suggestions!!