For working on my own property of approx. 4+ acres, can anyone recommend a Lawn Sweeper? I saw a few "tow behind" units on the net and would like your experienced opinions as to their usefulness. Also, which brand would you recommend? I would like to sweep the large flat lawn areas - about once a month - to pick up the build-up of grass cuttings. I have a Hustler Mini Z 24/52.