Oh I see. I gave you too much information, didn't I? You're just looking into the possibility of replacing it with a better uni chassis rather than a different chassis. That's not that difficult (???), but you have to take extra care with the Uni body as it has to be picked up in one piece rather two pieces like the regular cab/bed setup. Probably not that difficult to find a bare frame or a rolling frame and refurbish it before you install it. Post an ad under "Wanted Parts" and someone more than likely has a frame for you. Be sure to post where you live, makes it easier to hook up with another member.