Does CW Optimus Prime have any kind of trailer hitch on the truck mode? If so, you might try experimenting by seeing if CW Optimus Prime can attach to any pre-existing OP trailers. Cos I know that RtS Deluxe Class Optimus Prime is reverse-compatible with G2 Laser Optimus Prime's trailer.

Perhaps some of our other members here might be kind enough to help out. I don't have a CW Optimus Prime, but I do have CW Motormaster, so I might try it out with him later this week or next.