What are the major differences on the Hustler Z and Mini Z's? Are they basically built on the same frame ... as far as strength and design? From what I can tell on reading the specs on each mower, the major difference in construction is the width of the mower in the "tire to tire" width. Is this the big difference ... hence the "Mini" ... the physical size of the machine? I understand the differences of the mowers when it comes to the "Super" (seat, hydro pumps, etc) ... just wondering what the other differences are (other then deck sizes also) Also .... Are there any promotions (current or coming up) on the Trimstar Hydro 48" WB? My dealer (Plainfield Equipment, Plainfield, Indiana) honors the Hustler promotions, but I have not talked to him about the 48" yet.