Phil, how did you find that in a search? All I got was that bogus Zimbabwean link.
That tire is basically already out in the KR2 race tire that I linked to earlier and for the side by side guys a 30". It's **************! The 35 x10.50x15 only weighs 48 lbs. They unfortunately are cast in race rubber at the moment. I know they have a 33"x10.50 that the baja guys need for the front in the works. Believe it or not a lot of them run the same AT's you buy at Discount tire. I don't remember the formula but for every pound of unsprung rotating weight that you remove is like taking many times the weight off a vehicle. Going to light wheels and tires on our rigs would feel like removing the camping gear for example. I have a whole box of new light weight rotating goodies for the rail. I'll post a pict of the bling later but check out the side by side tire, the price and the same sidewall that's in your link.
http://www.holzracingproducts.com/product/bfg-kr2-30x10x15-utv-tire/