From what I've seen, the RV industry is run similar to how computers are manufactured. That is, the RV "factory" is mostly a final assembly plant for a lot of generic components. So for instance, if you need parts for your Suburban water heater, you can source those parts from anyplace that sells or services that brand.
As for graphics, I would suggest you check with a company in your town that does things like vinyl wraps for commercial vehicles. They can likely do graphics for you, or suggest someone who can.
Like it or not, these RV's still pretty come to us "some assembly required". Part of the fun of RV ownership !
EDIT: ps....out of curiosity, I did a search for vinyly graphics rv, and got numerous hits, among them, this company:
http://www.rvsg.com/index.asp
.... I suppose there are others as well.