From the responses - NOT - posted, it looks like I am the only one with practical field experience in using the 2520 in a bizzard and heavy snow conditions. Here's my feedback: R4 LOADED tires = Great traction in snow, BUT - I found that scraped snow or any smooth snow that was just a little bit icy leads to some wheel spin, especially on a good driveway hill - which I have. Not much of a problem when using the s'blower, but loss of traction does cause me to have to lift the back blade, particularly when moving UPHILL
whilst plowing.
I called my JD dealer to ask about chains for my 2520 R4's (rear only). He laughed and said, "You're just one of several guys I've heard from this morning about that." He was referring to those owners who live on the Northern West Michigan lakeshore who were trying to deal with a one day 17" snowfall with subsequent 6" and 8" drops on following days.
Realize that this was unusual snowfall, even for our area, and that some slippage problems occurred only AFTER the major portion of the snow depth had been blown / cleared. I will likely get a set of chains - just in case. Also realize that I arrived in South Florida - for the duration - yesterday and probably will not be concerning myself a whole lot with the snow removal issue in Michigan for some time to come!