So I tried looking around but maybe I'm just missing the topic completely. 

 

The big question, How do I do chevrons onto the back of an ambulance? Red and yellow would look good. Anyone have any good tutorials? Any pointers on the skin its self? Thanks.

 

 

I Would Suggest Using These, it comes with a photoshop file that comes with different colors and layers. as for tutorials its kind of more like trial and error depending on knowledge of photoshop.

 

Create a rectangle and skew it at an angle, then duplicate it a few times while moving the duplicate rectangles to your liking and then flip it to the other side, once that's done just merge them all together and you're finished. If you want to overlay a texture too it (like the honeycomb) either take one from online and overlay it onto your layer and trim it, or make one yourself.