If you duplicate the suspension components, you can map them to a completely new texture group. It can make new textures easier to make and doesn't overwrite the original textures.
If anyone is interested I might think of making a separate thread or group for it, so if anyone else has any travel trailer skins they could just release them there. I think its done.
Are you asking if used one? No i did not. If your asking for me to create one, probably not happening but i would be happy to tell you how i did it. You will need a good understanding of blender first though, so do not ask me "how did you do _____" for something i say thats blender related. What i did to make the cage is used curves for most of it. So for a wheel arch, i would make a curve that followed the wheel arch on the body and i also bent it at the bottom to follow the bottom of the car. Then i used a 10 vert circle that i made into a short cylinder and used the array modifier to make more if it and a curve modifier to make it follow the curve. For any straight parts, like where the rear window will be, i just duplicated that same 10 vert circle(not a cylinder) to form a cylinder that extends where i need it to go. I also used smooth shading and edge split set to 55 to get it looking smooth. Finally to make the joins i would push the part im joining away from the part im joining too, not a lot though. I then fill in the gap. Theres not real way to do this, just do it so it looks nice. Looks nice means no sharp edges and it looks smooth like i showed in the pictures. Also different people have different ways. Others may do it different. This is just my way.
imma just give you this. should help you with getting good polyflow http://darkscarab.com/view/43 do a search like this too. should have some good stuff for beamng polyflow EDIT. somebody told me you were french. this may be easier to understand?
A quick look at your console (~) will show whether you've got an exception or not. (eg whether it's the jbeam)