overszd:
I could not find any deal on 55gal drums of windshield washer fluid.
Just bought 80 (single) gallons of -20F windshield washer fluid for $1.42 (with tax - $114).
Tire liquid fill fitting at TSC was $9.xx. W/W fluid is not completely environmental friendly, as it does contain methanol.
Animals will not lick W/W fluid though, as they will with sweet ethylene glycol (automotive anti-freeze). Automotive anti-freeze WILL KILL animals (dogs - cats - farm animals, etc.)!
"beet juice" may be the best choice for tire
ballast, but in my area it would cost me more than 3X what I paid for W/W fluid.
Beet juice is environmentally friendly, and weighs about 10.8 lb./gal. W/W fluid weighs less, at about 8 lb./gal., but in my opinion the beet juice is not worth 3X the cost of W/W fluid.
R/V antifreeze is another envionmentally correct choice, but also does not weigh as much as beet juice, and is too costly as well!