??? Wife and I just purchased a Wildcat 301RES. We also looked at a 311RKS. Between the two models we couldn't find any differences. Conventional thought would be one is 30' coach and the other is 31'. Not so, according to the specs they are both exactly the same. The other thought would be is RES is rear entertainment and RKS is rear kitchen. However both are rear kitchen with same floor plan. Just curious if anyone knows what the difference is. I couldn't find anything searching the web. I didn't try contacting Forest River as it's really just a curiosity thing. We liked the 311RKS then saw a 301RES that had inside colors we preferred so bought it.