The manual says it will do a 72" which actually suprised me I thought even a 60" might be the max. My new place is a overgrown field so i don't want to push the little tractors limits, does a 60"er seam right?
I have a 60" bushhog with my B2710 12" wider than recomend. A 60" should work just fine. A 70" would be faster but it would more bulkey and more expensive.