It is a top air atv sprayer, I pull it with my JD gator, you can adjust wheel widths. My brother sprays, it runs chem. and water tank and fill him up in under 2 minutes flat!
What about the thought of a hydraulic drive on your customized JD 7000 planter like 48 suggested? The bonus would be having variable rate capability. You probably already know where the most productive field spots are and the low yield areas. A good way to match seed population to potential.