Well what can I say...I happened to be playing around on the net and found the site. I am down here in Arizona and currently own a 2008 Kawasaki Teryx with a few mods. Guess we do not have a lot of mud or snow, however, does not mean that I have never seen it ;)
Anyhow, thought I would say...
HAHA ya amazing what can be developed with a few tools and beer. That was something that I noticed as well is how low the exhaust is. Obviously this was done in order to accomodate for the rear store under the bed.
I installed one on my Teryx, and imagine everyone is using the Unisteer units. It can be frustrating as previously mentioned, however, you will forget all about that once you drive it for the first time ;)
Here is a thread with a Commander, Rzr, and Rzr S to give you a good comparison of the widths and lengths.
Commander Vs RZR Vs RZR-S pics - Can-Am Commander Forums
I am not 100% sure, however, I think that is private property belonging to Gorilla Axle. Nonetheless, not sure really what it proves to tear up grass with a motor vehicle.