Looking at one of these for my Dad, who will be mowing up a hill. We are getting the rear mower and fel. Is there supposed to be a ballast box included with the fel? If so, what does the ballast box weigh. Is there anyway to get a little more weight for my Dad on the front end in case it starts to rise going up hill. I heard the front weights get in the way of the fel and are not necessary since the fel is on..