Okay, basically, from what I've experimented with, ROTF Deadend/Detour can be attached to the Voyager Prime leg via opening trunk in car form and taking off Prime's lower leg. Then flip up the feet/hood of the car. I'm pretty sure they'll make a black repaint to use as Wildrider so you can do that twice. Brakedown, however, I do not own. He can probably wrap around prime's arm and use his hands as a claw or hand. Prime's leftover parts can be used as kibble, etc.