Your Provonost is 54" so with a 53" wheel width that's fine - you can add wings if you decide you need to later. For the mower you can offset the 3PT by maybe 3" to cover one wheel track for the short term. I agree a larger brush hog would be best. If I were you since there are only a few weeks of grass cutting left this year, keep the 4' unit this year and next year sell it and buy a larger one - its harder to sell in the fall I would imagine. IT seems all your other implements will work with the
B3350 you are getting? Was the price of $25K for the
B3350/B77 BH with your BX in trade? That seems like a decent price package..