I'm modelling a unique engine based on a prototype. It's an Alco switcher with AAR trucks on the front and Blunt trucks at the rear. I have a P2K S3 with AAR trucks, and I'm thinking of picking up a second unit, an S1 which has Blunt trucks. My question is this: is it possible to swap out one set of trucks for another and if so, how do you do it. The P2K S3 in question is the DCC model. The S1 I'm thinking of buying is not. Any help would be greatly appreciated. BTW, here's the prototype I want to model.