I used to do a bit of farming, and would like to add my experience with dual wheels. On a cub you may be able to get some more weight by adding fluid in all the tires, however in real life the dual wheels are for less load on single tires from implements, and the duals will not compact the land... that is the two main reasons they are used. A single wheel setup may surprise you that it will pull more especially in wet/slick areas as the dual wheels have the weight distributed over a wider area in contact with the ground.
Don't take this as a slam against duals, just what my experience has been, you may also google dual verses single wheels in farm equipment (may even change the search word around some).
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