Calcium cloride is the best product for the job.
It's cheap, I got a Ford 7700 with it in all 4 tires, that is a lot of gallons, it was minus 31 degrees the other day, minus 9 when i had to feed bales - 'a few gallons of wiper fluid' ain't gonna cut it for me!
It's heavier than water. Salt combines with water 7 becomes denser, something like 11 lbs per gallon, vs 8 for water, or 6 for some of the other fluids some here like to try. If you want weight, get some weight, not something lighter than water!
It's non-toxic. You spill a tire full of antifreeze or the cheap washer fluid 'here' and the Minnesota EPA is going to run you one heck of a bill. Sure it runs off all the roads in car accidents but that's ok it's city folk on concrete; but this here is out in a wild, where we need to protect the ducks and beaver and the groundwater, you are looking at a big issue if you try using toxic substances in a place they are not designed for. Aside from my grumbling, I would not be comfortable with that many gallons of toxic antifreeze waiting to spring a leak around my pets & groundwater, seriously. CC will kill the grass, but it is not toxic to the environment.
I've got fluid in 3 tractors, all rears and the one has the fronts as well. I'm considering what to do with the 5000 I got last year, it's aweful light in the rear pulling - and stopping wagons around. My tire people would be real upset with me if they worked on my tires & I has some other fluid in there. Mess up their service truck as they pump my junk out.... They wouldn't be happy, and rightly so.
A lot of the products mentioned aren't really so good for rubber long term; and don't provide a whole lot of protection to someone in the deep freeze like me, need 50/50 mix or more - who can afford that?
If you use the tractor, use the right product. CC or the beet juice. Anything else is junk, make a mess of things, bad deal.
If you are just parading the machine & leaving it sit in the shed, then why use any fluid at all - use air. But if you need the weight, use the proper fluid.
If you look through the archives, this topic is one of my pet peeves.
As always, to each their own, this is just my opinion - from the cold north.
--->Paul