Wasp .12 Roar is an SG crank/slide carb version. You'd want the Wasp Offroad or the Wasp SE for a truck. I have never driven a truck with a Wasp or an X12, but I have seen both run at my track, and from what I hear, the X12 will be similar to your MT12 (which is what I run). If you want something different, I'd say get the Wasp. Picco's are supposed to be very smooth on the bottom end and have tons of top end. I'd probably recommend the SE, as will Waldork, if he sees this thread.