As Others have said, model numbers mean nothing. Find a floor plan you like and then decide on the size you want. Imagine being in a campground. You say to your spouse..."You know, I really don't like how this is here or this won't fit there" and your spouse says..."I know. I hate how there's no room for my widgit but this camper fits in this camp site like a glove!" That scenario would get old in a hurry! Also, like others have mentioned, BH=Bunk House, RK=Rear Kitchen RL=Rear Living etc. If there's an "S" in the model number that usually indicates a slide out.