kirkpal1-
What are the make and model of the existing radio? A picture or two would help, too.
Tiffin should be able to help you with that information, also.
It is probably not a Ford radio on a coach as new as yours.
You would be looking at swapping between something like a JVC/Kenwood/Pioneer and whatever model you decided to buy from Crutchfield. At best, you would be able to get a plug-and-play harness for the swap. At worst, you would cut the wires at the old radio and splice onto them. In all cases, do not cut off the Ford/Tiffin-to-existing radio connector.
Are you having a problem with the radio, or do you just want a feature upgrade?
Lastly, I suggest you add a "signature" to your profile. It contains whatever info you want; most people put info about their coach there, so they don't have to type it into each message. Instructions for adding a signature are
here.