As far as I know, you're the guinea pig.
There's a lot of them on 900's but haven't heard of someone putting them on the 1100 yet.
A couple thoughts/questions...
With the 1100 weighing in at 2400# and having a cargo capacity of another 1600#, you can tip the scales at right around 2 tons.
Although the Bighorns are 6-ply but I've run the air pressure up pretty high (20+) and can still make them squat under a heavy load.
I wonder as these things get heavier and heavier if it's time to start thinking about off-road tires that fit jeeps and trucks. When I think of ATV tires, I think of tires rated for about 500#. Well, a loaded 1100 is going to probably put about 1300# on each of the rear tires.
Anyone have a weight rating for the Bighorns???