I don't have any info on the squeaking body, sorry. As far as how the camo is applied, most companies use water transfer printing hydrographics.
Here is a link that explains how it works. It always seems so amazing to me. By the way the durability would depend on how they protect it after the graphic is applied. Most companies use a clear topcoat over the graphics to protect them. I would think Double-Take would be able to give you more info on that. Good luck, though. I have emailed them five times in the past few months about becoming a dealer for their products and have never received a response.
https://www.youtube.com/watch?v=enFSoiCo-lA