I see a guy up at Bald mountain running a dual ultimate with a nice IFS lift on 37s. He says it doesn't break and I saw him hit the toughest stuff there. 3 wheel yeah but he made them, crawling. Hopping, full lock turns and lots of skinny kills cv's. And stock birfs for that matter. If you don't want to swap to a live axle get some gear reduction it will help.