Noticed in an earlier thread that it is not recommended to tow with the Phazer. I want to use a tow behind wing mower (580 lbs. dry weight) with a Z on some acreage props but have not bought the Z yet (Jan. for new tax year purchase). 52" is the max deck size, want to keep it somewhat agile for city props also. Which of the Exmark Z's would be recommended for this task and keep the warranty intact?