I don't know if this helps you. I have a 1993 Cobra Sunrise 20 foot. The man who started cobra (I think his name was Lugi or something like that) sold the company to some big banks. They bankrupted the company and then he bought the whole thing back at fire sale prices. He then started a company called Forest River.
If you do a lot of looking around the internet you can find out some things about these TT. I am on the wrong computer now or I would give you some info. That being said , I have never found out the info for things like tank sizes and such.
Sorry, I am just telling you what I know about Cobra.
I love my old Cobra Sunrise though ! It was well built.