All Viper Owners take a look at your front arm cross shaft on your rear skid. Especially if you are riding these sled super aggressively over heavy rutted trail trash. It looks like the shaft is shearing off right at the end of the bolt and the bushing support. It looks as if most of the damage is done to the shaft and the tunnel once it lets go. The bolt and collar should not be the same length so the stress on the shaft is not in the same place... thats my take on it. See the skid looks fine.