I am looking at a 2002 walker diesel. I have only used gas engine walker's in past. Does the extra weight make the unit even worse on hills? Has anyone used one with a 42" deck? The person who has the unit says the extra weight tracks his zoysia yard badly and wants to buy a 20 hp like he used to have. The dealer did a test with a new 20hp and it seemed to track it almost as badly. May be just because we have had an extra wet summer. What is a 2002 diesel with 48" deck (I'm planning on trading it for 42") and 179 hrs worth. Also includes large bagger and light kit. Looks like new.