Welcome to the Bota club. I've had a B7500 for 19 years now. Awesome machines that hold their value. I like mine so much that I may change the original fluids in the rear and hydraulic system next year when it turns 20.
I have a TSC King Kutter II 48" tiller on mine and it does an awesome job.
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The mid mount mower will mow grass knee high as fast as your 70 can go in 3rd gear down hill wfo.