In Reply to: Tire Ballast posted by Mike on March 11, 2019 at 17:46:41:
Water, or a derivative, is 8.35 pounds per gallon.
CaCl is about 12.5 pounds per gallon.
Cast iron is another option.
A 3 PT hook up with a 55 gal drum filled with water and a drain spigot is about 450 pounds.