Art - can you explain further on the weights? Which is twice of the other, the wheel weights or the filled tires, and why?
Some rims do not accept wheel weights and some do. With loaders most all tractors need rear ballast to offset the load. I like to size up the jobs as some might not require any, otherwise with the max which is normally three sets per side has seemed to be all that has been needed other then with extreme loader work and then to have the three point hitch ballast. This base weight with proper inflation will normally give the same traction as liquid filled tires on normal uses and it doesn't hinder the drive train life.
When adding the weights you do have the option to remove them, with liquid you do to but it is normally not done. To have it as solid weight is a plus and having it in the right place makes a big difference.