I have the 60 inch Cast (red) hi-lift. I wouldn't spend my money on the extreme for the top clamp tool. I think the Jack Mate is more versatile than that dohicky anyhow. I don't see why you wouldn't go for the 60 inch model. It fits up on the rack just fine. I'm not sure how often you'll need more than 48 in, but if you do, you'll be bummed when you need a few more inches. Especially for the folks with lifted rigs.