Crossroads is also owned by Thor, but from my quick research is not under the Keystone umbrella, they have their own web site and are listed separately on NADA. I couldn't find information on 2015 models yet but for 2017 according to NADA "Sunset Trail Super Lite models include the Sunset Trail Package, painted front cap, power tongue jack, outside camp kitchen, tri-fold sofa, 2nd skylight and sink cover." And "Sunset Trail Grand Reserve models include the Sunset Trail Package, automatic leveling system, power tongue jack, painted front cap, solid surface countertop, theater seating (33SI only), outside camp kitchen (26SI and 33SI only), fireplace, 8 cu ft refrigerator, roller shades, 50 amp service, 2nd skylight and sink cover.*
The 2015 26RB is listed here on NADA:
https://www.nadaguides.com/RVs/2015/...-26-RB/6537718