Down to votes now? I would go with windshield washer solution.
1. mild for the environment and the rim
2. Not too expensive - my tires each hold 30 gallons and the cold weather stuff would put roughly 470 lbs per tire - the -20f stuff can be had on sale for $1.50 a gallon at Walmart and other places or you can buy it by the 55 gallon drum for about $130 (plus shipping) here
3. Wheel weights are also great, if you can find them to fit but they are costly
4. I like having loaded tires myself, they help with FEL work but are NOT the end all/be all for a CUT with a heavy 4n1 bucket or grapple - when I take my BH off to swap it to my snow blower, for example, I find that my unloaded 4n1 (admittedly a bit too big for my tractor) makes my loaded rear tires so light that they can't gain traction in the snow and I have to move to 4wd to make way to my blower - I can't imagine how it would be without the loading.
Windshield wash is what ill be going with, no tubes. Also you said 30 gallons per tire, mine will take 29 i think. but windshield wash is roughly the same weight as water which is 8.35lbs/gallon. So 30 gallons would only be 250lbs per tire. Are my calculations wrong?
Im in Canada, so the link you provided does not ship to Canada. I can get it at walmart for 2.88 gallon, so taxes and all i can load the tires for around $200.
Thanks for all the help.