Forgot to add that most of the standard ramp door only will be too steep for the RS. You won't need a "custom" trailer, but rather you can use boards, or ramp extensions. I have the featherlite ones; they are 6' and fold up against the door. You can see them on their website. They worked great for my old 993 RS clone. For the cup car I have to put boards under the ramps. Check out a PCA, Chin, etc DE and you will see all kinds of trailers and can talk to people to see what they do and don't like. That's what I did and it helped a lot in finding which worked best for me.