Because there is no substitute for weight, a couple more bolted to each wheel. Pretty hefty. Mounted them up and now just waiting on the fronts to arrive and I will be back in business.
The thing about tires is, you just have to pay. By far my biggest $$ outlay, but choices are limited and at least they should be good for a few years.
Pretty good progress on the last remaining rusty area. Heck, at this rate I will just pull the sheet metal some weekend and have at it. (hmm.. I bet I have enough spare laying around to have a working tractor while I finish the sheet metal. And after all, a set of stickers came in the mail a couple days ago so thats motivation.