As of about 10 years ago when I still worked at a dealership bodyshop, we used an outside vendor for all of our pinstriping and decal work. He would be there every day replacing everything from tape pinstripes all the way up to the large bodyside graphics on the Nissan trucks. He did woodgrain on the rare occasion that we needed it replaced but that was usually a panel or two and done with the original woodgrain purchased from the car manufacturer. He did have access to all sorts of aftermarket graphics companies & would have easily been able to get some woodgrain vinyl to "woody" a vehicle if it was necessary.

I have no idea if he's still in business but at the time he was servicing many other bodyshops as well as ours.