I talked to a guy who body dropped his wagon and notched the frame. He used the stock trailing arms and it worked but like what Wagon Boy said, the wheels went way too far forward. He had 17s or 18s and they almost hit the back side of the door jamb. My opinion would be to do it right the first time, get the extended upper and lower trailing arms then notch the frame. It would suck to notch the frame then get the trailing arms to find out your notch is in the wrong place.