mine are about 400 lb for the four of them

 

Mongrol on the Polaris forum has a Sportsman 400 H.O. with tracks on it. There's no low range on it. He's in Canada and rides in a lot of snow. No problems with belt slippage or lack of power from what I've read. I think the Rincon could handle the tracks too but the Cat 650 has way more power.