I have had to travel by car and plane a lot with RSD and it is not fun. My worst is my legs and what helps one time does not another. For me though when I am in a flare having any pressure like a pillow etc makes me worse but everyone is different. I understand the road issue as I dread speed bumps. I try to keep my body as relaxed as possible because when I keep stiff it makes things worse. Also I am not sure if you have temp issues but the proper clothing because if I go frozen the pain increases and it is hard to settle down. I also agree with the distraction techniques.