I have a 2007 25RKS and the it has the smaller slide out. It slides out about 15 inches versus the larger slide out that go out about 32 inches.
The couch does slide out, but the fridge and the wardrobe do not slide out. Only the couch is on the slide out.
The little room it gains sure makes a difference. We purchased our 25RKS and brand new and have very few issues or problems.
Good Luck with your search and hopefully you will become a Jayco owner!!!