Mike,
The "Terrain" was introduced in 2013, although the Outback line has been around since 2002.
These are the only current Keystone lines with the rear bed slide. You may find a (somewhat) similar floorplan in
some of the light weight trailer lines, but the bunks are typically in the rear.
A word of caution -- be aware that the 260TRS has a hefty hitch weight (860 lbs, empty)... the bunks/sofa, ent center
& outdoor kitchen adds a lot of weight "up front". Generally speaking, this is usually too much hitch weight for "most"
1/2 ton trucks & SUV's [and especially once the family & trailer are loaded/ready to travel]!
Finding a good match for your tow vehicle is equally as important as finding the right floorplan.
Terri, the Chevy co-pilot