I have 5 acres and quite a few trees to clean up after. I mulch the leaves several times in the fall but need to get rid of fallen limbs. I have a ditch nearby that I have been filling with the limbs for the last 2 years. The area that I can get to is almost full. I've seen these chipper / shredders at the big box store and think that having one would be great. However, they have a 5 - 6 hp motor and don't seem to have a very large shute for limbs. When I do a cleanup, I have a trailer that I pull behind my mower and I fill it 6 or 7 times with limbs - overflowing each time. This occurs 3 to 5 times a year. Would one of these chippers work well for me? What is the maintenance like? Would I need to sharpen the blades after each use?