B6100d (Front Wheel Assist) has 10 x16.5 Skidloader tires on back and 23x8.5x12 front.
The b6000e had the 6x10 (no longer available) on front and 8x16 AG tires on the back.
My nephew near Abilene,Kansas bought this one from me and recently sold it again. It was pictured in an orange tractor...