beat juice = RV anti freeze (not toxic) (what i am using)
wind shield wiper fluid = another fluid folks use
i forget the other one = salt = rusting out rims (stay away from is recommendation)
would just load rear tires with a fluid. from picture / model listed in profile. you only have 2WD tractors.
with above said. i got tired of running over thorns on front tires and getting leaks. and filled the fronts with "green slime"
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google "gemplers tire valve" it makes life so much easier filling tires with fluid.
if you have a 12v sprayer (make it a simple hand wand, to other). get handful of parts needed to connect it to gemplers tire valve. and makes for nice quick filling, just keep an eye on pressure so you do not over pressurize the tire.
if ya get down to it. you might find a cheap 110v sump pump at local hardware store on sale. you do not need much GPH nor pressure. even a cheap pond pump. though prefer using the sprayer, due to already had a container and pump. and less messy for me. and i can use sprayer for other things.
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checking air tire pressure with fluid filled tires. can be messy, and can also rust out / cause sticking of generic cheap little air pressure gauges. they sell more expensive gauges to handle fluids.
i also cheated, the valve stem core tool i had was bent. so i needed a tool to remove the valve core for filling tires with fluid. so green slime already had tool that came with package thing. it was an excuse for green slime, but has worked.