Hi Chris here at Outback, we have over the years installed a few 3500 original style axels for a more HD use, our standard
Trillium axel we use are a 2200 lbs flexi ride axel thats fully adjustable for more ground clearance and opens the wheel wells for a larger tire as well. One important thing , make sure your frame is in good shape to take some of the off road abuse.
Joe