Assuming the fluid is Calcium Chloride, I would suggest doing the draining outside in a spot that you don't want anything to grow for several years. You will spill some solution and it will kill about anything it lands on. Don't worry too much, as it washes away after a couple of years. But it will wreck a lawn. The strong salt solution is very tough on hands, so rubber gloves are a good idea. I also would have on good eye protection. The calcium chloride will rust tools like nothing else I have ever encountered, so if any tools get the solution on them, you want to carefully wash it off with lots of flowing water. If you spill the solution on concrete, you will be able to tell where it is, as the Calcium Chloride draws moisture out of the air and will appear wet when everything else is dry. I do not know a good way of getting all of the solution out of the tire without breaking the tire down and pulling out the tube, which is a lot of work. If your loaded tires are not leaking and seem to be working fine, you might consider just leaving them as they are. I doubt that unloading them would change the "footprint" of your tractor that much, and removing the fluid is a messy job. And you really should dispose of the removed fluid properly.....Maybe a farm tire dealer would accept it if you arrange for it beforehand. But just pouring it on the ground WILL leave a spot where nothing will grow for awhile. Good luck.
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