Strange textures when combining vehicles/materials

While working on a type of combination of the Roamer and the D15, I hit a little snag.



It's almost like both materials couldn't decide on what material to use.

Originally, I had the UVs of the Roamer-half be scaled to 0 and just placed somewhere in the pickup's uv so that the colors would be the same. But normal maps and such were of course also lost, so I went back to the original UV. But now this happens. Any ideas on fixing this?

 

It appears to be that exact problem. It seems the UVs were out of order; the "Skinable" UV layer was getting the normal textures while the "Normal" UV layer was taking the skins. I changed their order and it seems to have fixed it for the most part.

Thank you for the help/advice. ^^