You can't compare factory duals to tracks. Here that Case would have had triples on it. There was no large machine in our area only running factory duals. Had a picture of a neighbour running quads. No, not the best way to go but if you are going to run something one or two years you have some decisions on how big your bank account is. I can appreciate what one 1250 tire can do vs dual 650s but that also depends on what conditions you are dealing with too. Dual 650s spread the weight over a larger area and when driving on a thin layer of top soil that covers pudding below it, it was important to disperse the weight. No doubt tracks are good, but if you actually have to factor in cost and it is a one time thing then straddle duals or triples are an option. And yes, bigger rear tires. We ran 540-26s with the 30.5 + 18. 4 duals, otherwise the back end became the problem area. And no, I don't recall any combines running triples sitting with tore up drives. Ours is still running fine too.