I have a Class C RV and Boomtown has used it on the Front off their Web Site from the day they open. No one has talked to me about using the picture.

What are you seeking here?  If you just want the picture taken down, you may want to consider hiring a lawyer to send a Cease-and-Desist letter.  While a cease-and-desist letter has little legal impact, the lawyer's letterhead gets the recipient’s attention.     This is a relatively inexpensive way to put the person on notice that you are not going to let these actions continue and that you are serious about pursuing your legal remedies.  It also tells the person that they could get in legal hot water which will cost them a lot of legal fees if nothing else.  This will often convince them to stop their evil ways.   If you are thinking you will get them to pay you a royalty, I doubt that will happen. Please feel free to contact me.  There is no charge for this initial consultation and it is covered by attorney/client privilege.