Aha. You don't want a full mountain bike. Perhaps you should consider a fixed fork mountain bike? You won't be able to take a hybrid on the really rough trails that you take your fat tire suspension MTB on. As you know, a suspension (or both front and rear suspensions) will handle really rough roads. A fat tire, non-suspension bike will be able to handle medium rough roads. Hybrids might be OK for unpaved fire roads. Bike manufacturers all call these bikes slightly different things. Hybrid is a pretty generic term; some hybrids are geared like MTB and have fatter tires. Other try to be more like road bikes. I think you should go to lots of bike stores, look at bikes and ask what kinds of roads the bikes are best suited. Then test ride and pick.