The tread width on my TC33D with R4's is about 57". I have 60" rear blade, and I am happy with it. My FEL, MMM, & blade are all 60" wide. My dealer wanted to sell me a 72' rear blade, but since I have a lot of trees I opted for the 60". If I fit through a hole with one attachment, I can fit through the hole with anything else. The only problem that I expect to run into is if I angle my blade for snow removal. If I do this, trigonometry will come into play and then I won't be able to cover my tracks if I angle my blade more than 15 degrees. I am thinking about getting a 63" nylon insert for snow removal which should be good for 25 degrees. Angling shouldn't be a problem with a box blade. Just my $0.02.