A 1.5" spacer will level your Trailboss. If you want to keep the rake, you could add a larger block and u bolts to the rear. However, if you want to lift the truck any higher you will have to get a full suspension lift kit. You cannot put a larger spacer on the front like that without new suspension components to adjust for the new height difference. There is currently only a 4" lift kit available for the Trailboss. This kit adds on to the 2 inch stock lift for a total height of 6 inches. You would need the entire kit to perform this lift not just the spacers.