Anyone got any experience with Material collection systems? I am thinking of getting one for my 4100, and before I do that I wanted to ask the forum and get some advice. Please suggest brands models, ..etc. I have slopes, so I am really wary of tow-behinds. But the units that hang on the back, also make the COG of the tractor higher as I am understand it, so they may potentially be worse on a slope if you are not careful.