ditzel:
I think you are pushing it with a 72"'er , but it really depends on what type of material you are working. Your tractor has pretty good weight for its footprint and 4WMFWD gives you more traction so moving gravel, dirt, and/or box blading "shallow" should work "ok", but if you intend to really work the BB in heavy, rocky, root obstructed clay based soil, you might have some operational challenges. I went through the same process as you and finally decided that for my needs and conditions a 60" was a better fit (especially in the woods). Jay
PS: If the price is right for a good quality, used BB go that way. If it is too much for your tractor you can always resell it. People are always looking for a used BB in good condition.